JEE Main 2026 Physics question
A circular loop of radius 20 cm and resistance 2Ω is placed in a time varying magnetic field T. At t=0, for the plane of the loop being perpendicular to the magnetic field and, the induced current in the loop at t=3 s is α/50 A. The value of α is . (Take π=22/7)
Answer: 44
Solution
EMF=A(dB/dt)=π(0.2)²(4t+2); at t=3, dB/dt=14, EMF=π(0.04)(14)=1.76V. Current=1.76/2=0.88=44/50 A.