An aluminium strip of mass slides down smooth

PHYSICS · Single correct · CBSE · Physics · Electromagnetic Induction · Electromagnetic Induction

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}

(b)

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

(c)

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

(d)

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