Question

The resultant force on the circular loop in Figure 8.33 has the magnitude of (a) 2proIB (c) 2roIB (b) pro 2 IB (d) Zero

Answer 1

Force on the circular loop

$F=BIL$

B=maximum flux density in $wb/m^2$

I=current flowing in the loop in A

L= active length of conductor in the magnetic field in m

$L=2 \pi \rho_0$

Therefore

$F=2 \pi \rho_0 I B$

Answer: option A