A straight copper wire long has a mass of

MATHEMATICS · Subjective · ISC · Physics · Gravitation · Laws of Motion

Problem

A straight copper wire

0.50\,\text{m}

long has a mass of

25\,\text{g}

. It is hung horizontally in a uniform vertical magnetic field of

0.20\,\text{T}

. Calculate the current required in the wire so that the magnetic force just balances its weight. (Take

g = 9.8\,\text{m s}^{-2}

.)

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