A horizontal copper wire of length and mass is placed in a uniform vertical magnetic…

MATHEMATICS · Single correct · A Level · Mathematics · Forces and Newton's laws · Forces and Newton's laws

Problem

A horizontal copper wire of length

0.50\,\text{m}

and mass

10\,\text{g}

is placed in a uniform vertical magnetic field of

0.20\,\text{T}

. What current should flow through the wire so that the magnetic force exactly balances its weight? \; (

g = 10\,\text{m s}^{-2}

) (a)

0.2\,\text{A}

(b)

0.5\,\text{A}

(c)

1.0\,\text{A}

(d)

2.0\,\text{A}