Two concentric coplanar circ loops 0 2 m and 2 m A time

Last updated: 6/9/2023

Two concentric coplanar circ loops 0 2 m and 2 m A time varying potential difference 4 2 5 t volt is applied to the larger loop Calculate current in the smaller loop sol The magnetic field at the centre O due to the current in the larger loop is B Hol 2R If p is the resistance per unit length then potential difference 4 2 5t B No 4 2 5t 2R 2 Rp resistance 2 R p r R so the field B can be taken almost constant over the entire area of the smaller loop I 4 2 5t the flux linked with the smaller loop is Bxr Ho 2R 2 Rp do Hor dt 4R p The corresponding current in the smaller loop is I then Induced emf e x 2 5 V 4 2 5t S r