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A magnet makes 30 oscillations per minut...

A magnet makes 30 oscillations per minute at a plane where intensity is `32N//weber`. At another place it takes Is to complete one oscillation. The value of horizontal intensity at the seeond place is,

A

`12.8 N//Wb`

B

`25.6 N//Wb`

C

`128 N//Wb`

D

`256 N//Wb`.

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