Question

A rod of length $50cm$ moves with a speed of $10cm/s$, in a uniform magnetic field of strength $10G$ at an angle of ${30}^o$ with the field. The emf induced across the ends of the rod is :

• A. $5000CGSunit$
• B. $2500CGSunit$
• C. $7500CGSunit$
• D. $1000CGSunit$

Answer 1

Answer: (B)

$2500CGSunit$

Given,

Velocity, $V=10cm/s$

Length of rod, $L=50cm$

Magnetic Field, $B=10G$

Motional $emf=BlV\sin \theta =10\times 50\times 10\sin {30}^o=2500CGSunit$