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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > Figure (a) shown two circular rings of radii a and b (a>b) joined together with wires of negligible resistance. Figure 3.15(b) shown thew pattern obtained by folding the small loop in the plane of the large loop. The pattern shown in Fig.3.15( c ) is obtained by twisting the small loop of Fig.3.15(a) through 180∘. All the three arrangement are placed in a uniform time varying magnetic field dB/dt=k, perpendicular to the plane of the loops. if the resistance per unit length of the wire is λ, then determine the induced current in each case.

Figure (a) shown two circular rings of radii a and b (a>b) joined together with wires of negligible resistance. Figure 3.15(b) shown thew pattern obtained by folding the small loop in the plane of the large loop. The pattern shown in Fig.3.15( c ) is obtained by twisting the small loop of Fig.3.15(a) through 180∘. All the three arrangement are placed in a uniform time varying magnetic field dB/dt=k, perpendicular to the plane of the loops. if the resistance per unit length of the wire is λ, then determine the induced current in each case.

A bar magnet is released from rest and starts falling through a metal ring as shown in fig A wire loop is suspended from a string that is attached to point P in the drawing. When released but in case (II) it has been cut through. discuss the motion of the magnet in both cases when it is above the ring and below the ring as well. consider ywo cases from left to right in case (I) the ring is solid all the way around the loop swings downward through a uniform magnetic field