Calculate the work required to move a charge of -0.31 Tries 0/12 The lines show

Question

Calculate the work required to move a charge of -0.31

Tries 0/12 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. The electric field at i is stronger than at j. Charge Q3 has the largest magnitude of all. The force on a proton at g points to the bottom of the page. The electric field at k is zero. Q1 is a negative charge. Charge Q2 is the largest negative charge. Calculate the work required to move a charge of -0.31 times 10-12C from i to b. Calculate the size of the electric field at g. Calculate the size of the force on a charge of 3.20 times 10-19 C at k. Calculate the size of Q3. The magnitudes of the three charges are in the exact ratios of 1 to 2 to 3.

Explanation / Answer

A) True, i is closer to a charge than is j so it has a larger potential.

B) True, as shown on a concept test, Q3 has the largest magnitude potential at the farthest distance from itself making it the largest charge.

C) 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.

D) 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. (Sum the vectors from the point charges for proof).

E) True, negative potentials surround negative charge.

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

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