a) The lines show the equipotential contours in the plane of three point charges
ID: 1395922 • Letter: A
Question
a) The lines show the equipotential contours in the plane of three point charges,Q1, Q2, and Q3. The values of the potentials are in kV as indicated for the +5, 0, and -5 kV contours. The positions of the charges are indicated by the dots.
The letters are on the equipotential contours.
True Or False The electric field at k is zero.
True Or False Charge Q2 is the largest negative charge.
True Or False The electric field at i is stronger than at j.
True Or False The force on a proton at g points to the bottom of the page.
True Or False Charge Q3 has the largest magnitude of all.
True Or False Q1 is a negative charge.
b) Calculate the work required to move a charge of -0.43x10-12 C from 'i' to 'b'.
c) Calculate the size of the electric field at 'k'.
Explanation / Answer
A.
1. False. The problem only says about potentials.
2. False. Greater charges have wider spaces between equipotential lines. Q1 is the greater negative charge.
3. True. It is closer to the charge than j.
4. False. It gets attracted to the negative charge Q2 and repelled by the positive charge Q3. The proton goes upward.
5. True. It has the largest inner circle.
6. True. The potentials around it is negative.
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