Given,
PQ arm is moving with constant speed
v perpendicular to the magnetic field
B.
Here, both resistances are in parallel, so their equivalent resistance,
R′== Now, the circuit becomes as shown in Fig. (b).
Length of
PQ=l Using expression of induced emf across
PQ is given by
ε=Blv ...(i)
Now, from figure (b), the equivalent resistance is
Req=R′+R =+R= Now, induced current in the circuit
(I through
PQ) is
I=εReq== [From Eq. (i)]