PHYSICS LESSON FORM TWO Experiment To make a

PHYSICS LESSON FORM TWO Experiment: To make a magnet by electrical method i. What is conventional flow of current? - Current flows in opposite direction of negative charges

ii. What is the difference between magnetic and non magnetic materials Magnetic materials Non-magnetic materilas Attracted by magnet , eg Iron, Are not attracted by a magnet nickle e. g Glass, wood iii. What does the domain theory state? - It states that, magnetic materials are made up of domains which contains small sub-atomic dipole that are aligned in a particular direction in one domain that is different from the other.

ACTIVITY Setup the apparatus as shown. A B

Step 1 – What observations do you make on the compass needle? v. Connect the solenoid to a direct current (d. c) supply. v. Place the steel bar inside the solenoid. v. Switch on the d. c supply. v. Place a compass needle at end A v. Observe the deflection when; - The switch is open The switch is closed The current is varied The current is reversed

What do you observe?

Step 2: How does the direction of current influence polarity

Step 3: - Why does the magnetic material put in the solenoid get magnetized when current flows?

Dipoles of a magnet

Group Work Assessment 1. The number of turns of solenoid affects the strength of the magnet formed by electrical method. Explain. 2. Quiz - Magnets can be used to off load containers from ships. Explain. 3. Project. - In groups of five do the following project; § Given a copper wire, insulating material, and a cylindrical rod, make a solenoid

CONCLUSION • Relating the clock rule and Fleming’s Right Hand Grip Rule with the learner's observations. - Clock rule states that…. .

Fleming’s Right Hand Grip Rule It state that…. .

Identify the polarity of end Q Q

End of presentation