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

Question

The curves 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/False) Charge Q3 has the largest magnitude of all.        
           (True/False) The potential energy of an electron at g is zero.        
           (True/False) Charge Q1 is the largest negative charge.        
           (True/False) The electric potential at i is higher than at j.        
           (True/False) The potential energy of an electron at i is positive.        
           (True/False) Q1 is a negative charge.        

Explanation / Answer

Charge Q3 has the largest magnitude of all. False
The potential energy of an electron at g is zero.   True
Charge Q1 is the largest negative charge.   False
The electric potential at i is higher than at j.   True
The potential energy of an electron at i is positive. False
Q1 is a negative charge. True

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