Question

A charge Q, located at the origin, produces an electric potential V = kQ/r at point...

A charge Q, located at the origin, produces an electric potential V = kQ/r at point r.  Which of the following statements concerning V is incorrect?

Question 10 options:

1)

The plane x = 5 is an equal-potential surface.

2)

V is positive if Q is positive.

3)

The spherical surface r = 5 is an equal-potential surface.

4)

V is negative if Q is negative.
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Answer #1

Expression for the electric potential, V = kQ/r------------------------------------(i)

So, if we draw a circle considering r = 5, the value of V is the constant.

So, option (3) is correct.

Again, if Q is negative, then from expression (i), V will also be negative.

So, option (4) is also correct.

Following above, option (2) is also correct.

Therefore, option (1) is the only incorrect option.

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