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A short magnet of length 4 cm is kept at...

A short magnet of length 4 cm is kept at a distance of 20 cm to the east of a compass box such that is axis is perpendicular to the magnetic meridian. If the deflection produced is `45^(@)`, find the pole strength `(H = 30 Am^(1))`

A

17.7 Am

B

44.2 Am

C

27.7 Am

D

37.7 Am

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