An overhead crane uses a long conductor placed perpendicular to a uniform magnetic…

MATHEMATICS · Single correct · A Level · Mathematics · Quantities and units in mechanics · Quantities and units in mechanics

Problem

An overhead crane uses a

1.5\,\text{m}

long conductor placed perpendicular to a uniform magnetic field of

0.20\,\text{T}

. To produce a lifting force of

30\,\text{N}

, what minimum current must flow through the conductor? (a)

150\,\text{A}

(b)

100\,\text{A}

(c)

50\,\text{A}

(d)

200\,\text{A}