A long straight conductor of mass is placed so that it makes an angle of with a…

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

Problem

0.30\,\text{m}

long straight conductor of mass

12\,\text{g}

is placed so that it makes an angle of

30^{\circ}

with a uniform magnetic field of

0.15\,\text{T}

. Determine the current required to keep the conductor just suspended in air. \; (

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

) (a)

2.6\,\text{A}

(b)

10.4\,\text{A}

(c)

5.2\,\text{A}

(d)

7.8\,\text{A}