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, Ql, 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. Qi is a negative charge. Charge Q_3 has the largest magnitude of at all. The electric field at i is stronger than at j. Charge Q_2 is the largest negative charge. The electric field at k is zero. The force on a proton at g points to the bottom of the page.

Explanation / Answer

1)True because negative potentials surround negative charge

(2) True, as shown on a concept test,Q3 has the largest magnitude potential at

the farthest distance from itself making it the largest charge.

(3)

True,i is closer to a charge than is j so it has a larger potential ( E= dV/ dr)

(4)

False, the first eqipotential ring around Q1 has greater radius.

(5)

False, the potential is not the field. The field describes the change in potential

and although the potential is instantaneously zero at k, the field is not

(6)

False, a proton will want to move away from the positive charge near the

bottom of the page; thus the force would be toward the top.

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