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  4. A magnet makes 40 oscillations per minute at a place having magnetic field induction of 0.1× 10- 5 T . At another place, it takes 2.5 texts to complete one vibration. The value of earth's horizontal field at that place is

Q. A magnet makes oscillations per minute at a place having magnetic field induction of . At another place, it takes to complete one vibration. The value of earth's horizontal field at that place is

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