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A block of mass m containing a net negat...

A block of mass m containing a net negative chage `-q` is placed on a froctionless horizontal tabe and is connected to a wall through an unstreached spring of spring constant k. If the horizontal electric field E parallel to spring is switched on , then the maximum compression of the spring is

A

`sqrt(qE//k)`

B

`2qE//k`

C

`qE//k`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
B
Force on the block: F=qE toward left.
Let spring be compressed maximum by x. then
`Fx=1/2 kx^(2)or qEx=1/2kx^(2)` or `x=(2qE)/(k)`.
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