1. A positive charge is moving from point A to point B in a uniform electric fie
ID: 1552836 • Letter: 1
Question
1. A positive charge is moving from point A to point B in a uniform electric field, as shown in the drawing. The electric force does __________ work on the charge and, as a consequence, its electric potential energy __________ .
a) positive, increases
b) negative, increases
c) negative, decreases
d) negative, does not change
e) positive, decreases
2. Four point charges have the same magnitude (but they may have different signs) and are placed at the corners of a square, as the drawing shows. What must be the sign (+ or -) of each charge so that both the electric field and the electric potential are zero at the center of the square? Assume that the potential has a zero value at infinity.
a) q1 and q3 are positive. q2 and q4 are negative.
b) q1 and q2 are positive. q3 and q4 are negative.
c) All of the charges are negative.
d) All of the charges are positive.
HAExplanation / Answer
Force in direction opposite to displacement, does negative work KE + PE = constant: KE decreases, PE increases
Option B
2)
In this problem, all the charges are same magnitude so all the cases will give the zero electric field and potential energy.
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