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The variation of induced emf( $e$ ) with the time ( $t$ ) in a coil if a short bar magnet is moved along $x$ -axis with a constant velocity is best represented as

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answer is B.

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Detailed Solution

Polarity of emf will be opposite in the two cases while entering and while leaving the coil. Only in option (b) polarity is changing. Hence, the correct option is option (b)

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