You are a distance D away from a point charge Q and you measure a potential V (a
ID: 584476 • Letter: Y
Question
You are a distance D away from a point charge Q and you measure a potential V (and there are no other charges in the vicinity). You move to a distance 2D from the charge. The electric potential at that point is
A) V
B) V/4
C) 2V
D) 4V
E) V/2
5.
Where would you expect to find the potential V to be zero? (select all that apply)
A) The potential is never zero
B) Somewhere between a + and a - charge
C) Somewhere between two + charges
D) At infinity
E) Somewhere between two - charges
6.
On an equipotential:
A) E = constant
B) E = 0
C) E = V
D) V = 0
E) V = constant
7.
You are moving to an increasing potential. This suggests that you might be: (select all that apply)
A) moving farther from a - charge
B) moving farther from a + charge
C) moving closer to a + charge
D) moving closer to a - charge
E) moving along an equipotential
Explanation / Answer
4.E, because potential varies inversely with distance.
5.D,B, in D the distance is infinity and potential vary inversely while in B the potential of both charge cancel each other.
6.B because E=-dV/dx
7.B,D because V=-kq/r
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