A rectangular loop of sides and is placed in the -plane

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A rectangular loop of sides

a

and

b

is placed in the

xy

-plane. A uniform but time-varying magnetic field

\mathbf{B}=20t\hat{i}+10t^2\hat{j}+50\hat{k}

is present in the region. The magnitude of induced emf in the loop at time

t

is (a)

20+20t

(b)

20

(c)

20t

(d) Zero