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Question

A block of mass m containing a net charge of q  is placed on a frictionless horizontal table and is connected to the wall through an unstretched spring of spring constant k .If the horizontal electric field E parallel to the spring is switched on, then the maximum compression of the spring is 



Correct Answer
A
2qEk
Your Answer
B
qEk
Your Answer
C
zero
Your Answer
D
qEk

Solution

The correct option is A 2qEk
Force on the block is, F=qE towards left.
Let spring be compressed by a maximum distance x. Then, the work done on the spring is given by
Fx=12kx2 qEx=12kx2  x=2qEk 

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