The lines show the equipotential contours in the plane of three point charges, Q

Question

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. (Give ALL correct answers, i.e., B, AC, BCD...)

A.)

A) The electric field at i is stronger than at j.

B) Charge Q2 is the largest negative charge.
C) Q1 is a negative charge.
D) Charge Q3 has the largest magnitude of all.
E) The force on a proton at g points to the bottom of the page.
F) The electric field at k is zero.

B.) Calculate the work performed by an external agent to move a charge of -0.35x10-12 C from `i' to `b'.

C.)Calculate the magnitude of the electric field at `k'.

D.)Calculate the magnitude of the force on a charge of 3.20E-19 C at `g'.

E.) Calculate the magnitude of Q3. The magnitudes of the three charges are in the exact ratios of 1 to 2 to 3.

Explanation / Answer

A)  True. potential at i is larger than j .

B) False. The eqipotential ring around Q1 has greater radius.

C)  True. due, negative potentials surround negative charge

D) True. Q3 has largest potential and largest charge.

E) False. force would be toward top of the page.

F) False. Field is not zero at point k.

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