A wire of length lies in a uniform magnetic field of while carrying a current of

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A wire of length

30\,\text{cm}

lies in a uniform magnetic field of

250\,\text{gauss}

while carrying a current of

400\,\text{mA}

. The wire makes an angle of

30^{\circ}

with the field. The magnitude of the force on the wire is closest to (a)

3.0\times10^{-3}\,\text{N}

(b)

1.5\times10^{-2}\,\text{N}

(c)

1.5\times10^{-3}\,\text{N}

(d)

7.5\times10^{-4}\,\text{N}