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A block of mass m having a charge q is p...

A block of mass m having a charge q is placed on a smooth horizontal table and is connected to a wall through an unstressed spring of spring constant k as shown in figure . A horizontal electric field E parallel to the spring is switched on. Find the amplitude of the resulting SHM of the block.

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` F=qE,F-kx[where x amplitude] `
` qE=-kx `
` or x=(qE)/k`
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