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.

The letters are on the equipotential contours.                                                                                                                                                                                        
            Charge Q2 is the negative charge with largest magnitude.          
            The electric field at k is zero.          
            The force on a proton at g points to the bottom of the page.          
            Charge Q3 has the largest magnitude of all.          
            Q1 is a negative charge.          
            The electric field at i is stronger than at j..          

The potential near a point charge decreases as 1/distance from the charge. The distance at which the potentials have a given value tells the size and sign of the charges involved. 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. Charge Q2 is the negative charge with largest magnitude. The electric field at k is zero. The force on a proton at g points to the bottom of the page. Charge Q3 has the largest magnitude of all. Q1 is a negative charge. The electric field at i is stronger than at j.. The potential near a point charge decreases as 1/distance from the charge. The distance at which the potentials have a given value tells the size and sign of the charges involved.

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