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Question

A block of mass m containing a net negative charge q is placed on a frictionless horizontal table and is connected to a wall through an unstretched spring of spring constant k as shown. If horizontal electric field E parallel to the spring is switched on, then the maximum compression of the spring is
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A
2qEk
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B
2qE/k
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C
qE/k
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D
Zero
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Solution

The correct option is D 2qE/k
At the point of max compression

Work done by spring = Potential due to the charge

Wspring=Vq

12kx2=Eqx

x=2Eqk

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