Question

A coil having an area $A_0$ is placed in a magnetic field which changes from $B_0$ to $3B_0$ in a time interval t. The e.m.f. induced in the coil will be

• A. $\frac{2A_0{B}_0}{t}$
• B. $\frac{4A_0{B}_0}{t}$
• C. $\frac{3B_0}{A_{0}t}$
• D. $\frac{4B_0}{A_{0}t}$

Answer 1

The correct option is A

$\frac{2A_0{B}_0}{t}$

$e=-\frac{d\phi }{dt}=\frac{-2B_0{A}_0}{t}$