Physics

Problem

An aluminium strip of mass

0.05\,\text{kg}

slides down smooth, non-magnetic rails inclined at

30^{\circ}

to the horizontal. The rails are

0.15\,\text{m}

apart and are connected at the lower end by a resistance of

0.10\,\Omega

. The region between the rails is occupied by a uniform vertical magnetic field of

0.40\,\text{T}

. After a short time the strip moves with a constant terminal speed

v

. Which value is closest to

v

? a)

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

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

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

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