Clicker Questions for NEXUSPhysics Electric Forces and Fields

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Clicker Questions for NEXUS/Physics Electric Forces and Fields

Clicker Questions for NEXUS/Physics Electric Forces and Fields

A. B. C. D. E. F 1→ 3 is twice as big as F

A. B. C. D. E. F 1→ 3 is twice as big as F 2→ 3. F 1→ 3 is half as big as F 2→ 3. F 1→ 3 is more than twice as big as F 2→ 3. F 1→ 3 is less than half as big as F 2→ 3. F 1→ 3 doesn’t affect q 3 at all since q 2 is in the way. NEXUS/Physics Clicker Questions Three identical charges are lined up in a row. If we compare the electric force charge q 1 exerts on charge q 3 (F 1 → 3) to the force q 2 exerts on charge q 3 (F 2→ 3)

A. B. C. D. E. A B C D You can’t tell. NEXUS/Physics Clicker

A. B. C. D. E. A B C D You can’t tell. NEXUS/Physics Clicker Questions In the figure are shown four arrangements of charge. Each charge has the same magnitude, but some are + and some are -. All distances are to the same scale. In which would the magnitude of the force felt by a positive test charge placed at P be the largest?

In the figure each of the red charges are positive and have the same

In the figure each of the red charges are positive and have the same magnitude. In which of the diagrams would the magnitude of the force felt by a positive test charge placed at P be the largest? A. B. C. D. Case 1 Case 2 Both are the same You can’t tell

A. B. C. D. E. 16 F 4 F F F/4 other NEXUS/Physics Clicker

A. B. C. D. E. 16 F 4 F F F/4 other NEXUS/Physics Clicker Questions Two small objects each with a net charge of Q (positive) exert a force of magnitude F on each other. We replace one of the objects with another whose net charge is 4 Q. The original magnitude of the force on the Q charge was F; what is the magnitude of the force on the Q now?

1. 2. 3. 4. They would stay the same Both would reverse Only the

1. 2. 3. 4. They would stay the same Both would reverse Only the left force would reverse Only the right force would reverse 5. Something else NEXUS/Physics Clicker Questions In the original state we assumed Q was positive. If the symbol Q were taken to have a negative value, how would the forces change compared to the original state?

NEXUS/Physics Clicker Questions A test charge (labeled q) is placed in a situation in

NEXUS/Physics Clicker Questions A test charge (labeled q) is placed in a situation in which it feels the electrical force from three other charges (of opposite sign to it) labeled A, B, and C. (The charges are on a uniform grid as shown and the positions are to scale. ) Which of the following combinations of forces is the greatest? 1. 2. 3. 4. There is not enough information to tell.

Two identical conductors hang from nonconducting strings. They are given charges q 1 =

Two identical conductors hang from nonconducting strings. They are given charges q 1 = Q and q 2 = 3 Q. After charging, the two strings make angles of θ 1 and θ 2 with the vertical. How do the angles compare? 1. 2. 3. 4. θ 1 > θ 2 θ 1 < θ 2 θ 1 = θ 2 You don’t have enough information to tell.

1. 2. 3. 4. 5. 6. 7. 8. Case 1 Case 2 Case 3

1. 2. 3. 4. 5. 6. 7. 8. Case 1 Case 2 Case 3 Case 4 Cases 1 & 2 Cases 1 & 3 Cases 2 & 4 Cases 3 & 4 NEXUS/Physics Clicker Questions In each of the four cases shown below, a particle of charge +q is placed a distance d from a particle of charge +4 q. The particles are then released simultaneously. The masses of the particles are indicated in the diagram. Rank the magnitude of the acceleration of the RIGHT HAND particle just after it is released.

A. Depends only on the magnitude of the test charge used to measure it.

A. Depends only on the magnitude of the test charge used to measure it. B. Depends only on the sign of the test charge used to measure it. C. Depends on both the sign and magnitude of the test charge used to measure it. D. Does not depend on the test charge used to measure it. E. None of the above. NEXUS/Physics Clicker Questions The electric field at a particular point in space

A test charge, q, is a distance d from a charge Q as shown.

A test charge, q, is a distance d from a charge Q as shown. It feels an electric field, E 0. A. B. C. D. E. F. Change to -3 E 0 Change to -E 0/3 Not change Change to 3 E 0 Change to E 0/3 Something else NEXUS/Physics Clicker Questions If q were replaced by a charge – 3 q, the electric field it feels would