MAGNETIC EFFECT OF ELECTRIC CURRENT The force of
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![• The force of attraction or repulsion in and around a magnet is • The force of attraction or repulsion in and around a magnet is](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-2.jpg)
![When a magnet is cutting into two parts When a magnet is cutting into two parts](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-3.jpg)
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![Defining a magnetic field Region around a magnet where its force can be felt Defining a magnetic field Region around a magnet where its force can be felt](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-6.jpg)
![How is a magnetic field represented ? Magnetic field is represented by magnetic lines How is a magnetic field represented ? Magnetic field is represented by magnetic lines](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-7.jpg)
![What are magnetic field lines ? It is the path taken by a unit What are magnetic field lines ? It is the path taken by a unit](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-8.jpg)
![Magnetic field pattern due to a bar magnet 1. The field lines start from Magnetic field pattern due to a bar magnet 1. The field lines start from](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-9.jpg)
![If you bring iron filings or iron nails close to a magnet, the filings If you bring iron filings or iron nails close to a magnet, the filings](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-10.jpg)
![A current carrying straight conductor produces a magnetic field – An activity A current carrying straight conductor produces a magnetic field – An activity](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-11.jpg)
![How will you find the direction of the magnetic field? How will you find the direction of the magnetic field?](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-12.jpg)
![To determine the direction of the magnetic field produced in a conductor carrying current To determine the direction of the magnetic field produced in a conductor carrying current](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-13.jpg)
![Right Hand Thumb Rule When a current carrying conductor is held in the right Right Hand Thumb Rule When a current carrying conductor is held in the right](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-14.jpg)
![What happens when the direction of the current through the conductor is reversed? What happens when the direction of the current through the conductor is reversed?](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-15.jpg)
![5. What happens to the (i) number of magnetic field lines (ii) magnetic field 5. What happens to the (i) number of magnetic field lines (ii) magnetic field](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-16.jpg)
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![Magnetic field pattern due to a circular loop carrying current Magnetic field pattern due to a circular loop carrying current](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-18.jpg)
![The magnetic field strength at the center of a circular coil carrying current (i) The magnetic field strength at the center of a circular coil carrying current (i)](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-19.jpg)
![A Solenoid An insulated copper wire wound in the form of a cylinder is A Solenoid An insulated copper wire wound in the form of a cylinder is](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-20.jpg)
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![2. As the current flowing through the solenoid increases , the magnetic field strength 2. As the current flowing through the solenoid increases , the magnetic field strength](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-22.jpg)
![3. As a soft iron core is introduced in a solenoid, the magnetic field 3. As a soft iron core is introduced in a solenoid, the magnetic field](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-23.jpg)
![Finding the polarity of the magnetic field produced by a current carrying solenoid If Finding the polarity of the magnetic field produced by a current carrying solenoid If](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-24.jpg)
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![• A current carrying conductor when placed in a magnetic field experiences a • A current carrying conductor when placed in a magnetic field experiences a](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-26.jpg)
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![State Fleming’s Left Hand rule. • Stretch the thumb, the forefinger and the centre State Fleming’s Left Hand rule. • Stretch the thumb, the forefinger and the centre](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-35.jpg)
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- Slides: 39
![MAGNETIC EFFECT OF ELECTRIC CURRENT MAGNETIC EFFECT OF ELECTRIC CURRENT](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-1.jpg)
MAGNETIC EFFECT OF ELECTRIC CURRENT
![The force of attraction or repulsion in and around a magnet is • The force of attraction or repulsion in and around a magnet is](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-2.jpg)
• The force of attraction or repulsion in and around a magnet is called magnetism. • Magnetite or lodestone is an ore of iron – the magnet that is found in nature.
![When a magnet is cutting into two parts When a magnet is cutting into two parts](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-3.jpg)
When a magnet is cutting into two parts
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![When a magnet is placed near a current carrying conductor When there is no When a magnet is placed near a current carrying conductor When there is no](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-5.jpg)
When a magnet is placed near a current carrying conductor When there is no current flowing through the circuit, there is no deflection in the magnetic compass. When current flows through the circuit, the magnetic compass deflects.
![Defining a magnetic field Region around a magnet where its force can be felt Defining a magnetic field Region around a magnet where its force can be felt](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-6.jpg)
Defining a magnetic field Region around a magnet where its force can be felt is known as the magnetic field. Why does the iron fillings form pattern? Due to the force exerted by the magnet, the iron filings arrange themselves in patterns as shown above.
![How is a magnetic field represented Magnetic field is represented by magnetic lines How is a magnetic field represented ? Magnetic field is represented by magnetic lines](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-7.jpg)
How is a magnetic field represented ? Magnetic field is represented by magnetic lines of forces (or) field lines.
![What are magnetic field lines It is the path taken by a unit What are magnetic field lines ? It is the path taken by a unit](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-8.jpg)
What are magnetic field lines ? It is the path taken by a unit North pole when placed in a magnetic field.
![Magnetic field pattern due to a bar magnet 1 The field lines start from Magnetic field pattern due to a bar magnet 1. The field lines start from](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-9.jpg)
Magnetic field pattern due to a bar magnet 1. The field lines start from N-pole and enter into the S-pole. 2. No two lines will intersect with each other. 3. Inside the magnet the field lines move from S-N pole. 4. The magnetic lines of forces are crowded near the pole.
![If you bring iron filings or iron nails close to a magnet the filings If you bring iron filings or iron nails close to a magnet, the filings](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-10.jpg)
If you bring iron filings or iron nails close to a magnet, the filings or nails will get attracted to the magnetic poles. The centre of the magnet does not attract the filings or the nails. Why ? Because the magnetic lines of forces are crowded near the poles.
![A current carrying straight conductor produces a magnetic field An activity A current carrying straight conductor produces a magnetic field – An activity](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-11.jpg)
A current carrying straight conductor produces a magnetic field – An activity
![How will you find the direction of the magnetic field How will you find the direction of the magnetic field?](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-12.jpg)
How will you find the direction of the magnetic field?
![To determine the direction of the magnetic field produced in a conductor carrying current To determine the direction of the magnetic field produced in a conductor carrying current](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-13.jpg)
To determine the direction of the magnetic field produced in a conductor carrying current Right Hand Thumb Rule
![Right Hand Thumb Rule When a current carrying conductor is held in the right Right Hand Thumb Rule When a current carrying conductor is held in the right](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-14.jpg)
Right Hand Thumb Rule When a current carrying conductor is held in the right hand, so that the thumb is stretched along the direction of the current, then the fingers wrapped around the conductor gives the direction of the magnetic field.
![What happens when the direction of the current through the conductor is reversed What happens when the direction of the current through the conductor is reversed?](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-15.jpg)
What happens when the direction of the current through the conductor is reversed?
![5 What happens to the i number of magnetic field lines ii magnetic field 5. What happens to the (i) number of magnetic field lines (ii) magnetic field](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-16.jpg)
5. What happens to the (i) number of magnetic field lines (ii) magnetic field strength When the current in the conductor increases?
![Strength of the Magnetic Field A stronger current will produce a stronger magnetic field Strength of the Magnetic Field A stronger current will produce a stronger magnetic field](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-17.jpg)
Strength of the Magnetic Field A stronger current will produce a stronger magnetic field around the wire as shown in Figure below.
![Magnetic field pattern due to a circular loop carrying current Magnetic field pattern due to a circular loop carrying current](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-18.jpg)
Magnetic field pattern due to a circular loop carrying current
![The magnetic field strength at the center of a circular coil carrying current i The magnetic field strength at the center of a circular coil carrying current (i)](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-19.jpg)
The magnetic field strength at the center of a circular coil carrying current (i) Increases when the Current flowing through the coil increases. (ii) Increases as the Number of turns of the coil increases. (iii) decreases as the radius of the coil increases.
![A Solenoid An insulated copper wire wound in the form of a cylinder is A Solenoid An insulated copper wire wound in the form of a cylinder is](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-20.jpg)
A Solenoid An insulated copper wire wound in the form of a cylinder is called a solenoid. A current carrying solenoid behaves as a bar magnet.
![Factors affecting the magnetic field strength due to a current carrying solenoid 1 As Factors affecting the magnetic field strength due to a current carrying solenoid 1. As](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-21.jpg)
Factors affecting the magnetic field strength due to a current carrying solenoid 1. As the number of turns of the coil increases, the magnetic field strength also increases.
![2 As the current flowing through the solenoid increases the magnetic field strength 2. As the current flowing through the solenoid increases , the magnetic field strength](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-22.jpg)
2. As the current flowing through the solenoid increases , the magnetic field strength also increases.
![3 As a soft iron core is introduced in a solenoid the magnetic field 3. As a soft iron core is introduced in a solenoid, the magnetic field](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-23.jpg)
3. As a soft iron core is introduced in a solenoid, the magnetic field strength also increases.
![Finding the polarity of the magnetic field produced by a current carrying solenoid If Finding the polarity of the magnetic field produced by a current carrying solenoid If](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-24.jpg)
Finding the polarity of the magnetic field produced by a current carrying solenoid If the current flows in clockwise direction – S pole If the current flows in anti-clockwise direction – N Pole
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![A current carrying conductor when placed in a magnetic field experiences a • A current carrying conductor when placed in a magnetic field experiences a](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-26.jpg)
• A current carrying conductor when placed in a magnetic field experiences a force and then moves.
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![State Flemings Left Hand rule Stretch the thumb the forefinger and the centre State Fleming’s Left Hand rule. • Stretch the thumb, the forefinger and the centre](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-35.jpg)
State Fleming’s Left Hand rule. • Stretch the thumb, the forefinger and the centre finger of the left hand mutually perpendicular to each other, • the forefinger in the direction of magnetic field, • the centre finger in the direction of current , then the • thumb will point in the direction of the force acting on the conductor.
![An Electric Motor An Electric Motor](https://slidetodoc.com/presentation_image_h/e3256789ff91ea39eba015609b14fdd2/image-36.jpg)
An Electric Motor
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