A long wire carries a current of

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

Problem

A

0.25\,\text{m}

long wire carries a current of

8\,\text{A}

. What minimum magnetic field strength, acting at

90^{\circ}

to the wire, is required so that the wire can just support an attached mass of

0.020\,\text{kg}

? Take

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

.

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