Physics

Problem

A square loop of side

0.20\,\text{m}

and resistance

2\,\Omega

lies entirely in a uniform magnetic field of magnitude

0.50\,\text{T}

directed perpendicular to the plane of the loop. The loop is pulled sideways out of the field region with a constant speed of

1.0\,\text{m\,s}^{-1}

. What is the mechanical power that must be supplied to keep the loop moving at this speed? a)

10\,\text{mW}

5\,\text{mW}

50\,\text{mW}

0.5\,\text{mW}