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It is desired to measure the magnitude o...

It is desired to measure the magnitude of field between the poles of a powerful loud speaker magnet.A small flat search coil of area `2cm^2` with 25 closely wound turns, is positioned normal to the field direction, and then quickly snatched out of field region. Equivalently , one can give it quick turn to bring its plane parallel to the field direction. The total charge flown in the coil (measured by a ballistic galvanometer connected to coil) is 7.5 mC.The combined resistance of coil and the galvanometer is `0.5 Omega`.Estimate the field strength of magnet.

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