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Electric potential is a scalar quantity....

Electric potential is a scalar quantity. Due to a point charge charge q at distance r, the potential is given by `V=(q)/(4pi in_(0)r)`. A point charge q is placed at `(3a, 0)` and another charge `-2q` is placed at `(-3a, 0)`.
At how many points on the x-axis, (at finite distance) electric potential will be zero?

A

1

B

2

C

3

D

4

Text Solution

Verified by Experts

The correct Answer is:
B
Let the poyential will be zero at x distance from `-2q`

`:. (Kx-2q)/x+(Kq)/((6a-x))=0 :. x=4a`
`(Kx-2q)/x+(Kq)/(6a+x)=0rArr x=-12a`
OR
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