A block of mass \( m \) containing a net positive charge \( q \) is placed on a smooth horizonta...

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A block of mass \( m \) containing a net positive charge \( q \) is placed on a smooth horizontal table which terminates in
\( \mathrm{P} \) a vertical wall as shown in figure (29-E2). The distance of the block from the wall is \( d \). A horizontal electric field
\( \mathrm{W} \) \( E \) towards right is switched on. Assuming elastic collisions (if any) find the time period of the resulting oscillatory motion. Is it a simple harmonic motion ?
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