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[" 17.A magnet makes "40" oscillations p...

[" 17.A magnet makes "40" oscillations per minute at a place "],[" having magnetic field intensity of "0.1times10^(-5)T" .At another "],[" place,it takes "2.5sec" to complete one vibration.The "],[" value of earth's horizontal field at that place is "],[[4a sqrt(0.25times10^(-6))T," (b) "0.36times10^(-6)T],[" (c) "0.66times10^(-8)T," (d) "1.2times10^(-6)T]]

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