A small magnetic needle performs 10 osci...

A small magnetic needle performs 10 oscillations/minute in the earth's horizontal magnetic field . When a bar magnet is placed near the small magnet in same position , frequency of oscillations becomes `10sqrt2` oscillations/minute . If the bar magnet be turned around end to end , the rate of oscillation of small magnet will become

`5 sqrt2`/min

`20sqrt2`/min

`2sqrt2`/min

Zero

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