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.

A.Calculate the work performed by an external agent to move a charge of -0.39x10-12C from `i' to `b'.

B.Calculate the magnitude of the electric field at `g' .

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

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

I have asked this question before and keep getting it wrong! PLEASE HELP!!!

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. Calculate the work performed by an external agent to move a charge of -0.39x10-12C from 'i' to 'b'. Calculate the magnitude of the electric field at 'g' . Calculate the magnitude of the force on a charge of 3.20E-19 C at 'k'. Calculate the magnitude of Q3. The magnitudes of the three charges are in the exact ratios of 1 to 2 to 3.

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