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

A block of mass m containing a net negative chage `-q` is placed on a

1.	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
Answer» Correct Answer - 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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