Question

A semi circular arc of radius $R$ is placed in a uniform magnetic field as shown. It is pulled with a constant velocity. The induced emf in the arc is:

• A. $Bv(\pi R)$
• B. $Bv(2 \pi R)$
• C. $Bv(2 R )$
• D. $Bv ( R )$

Answer 1

Answer: (D)

$EMF = Bv (2 R ) \sin 30^{\circ}$
$= BRv$