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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > in fig. The four rods have λ resistance per unit length. The arrengement is kept in a magnetic field of constant magnitude B and directed perpendicular to the plane of the figure and directing in ward. Initially, the sides as shown form a square. Now each wire starts moving with constant velocity v toward the opposite wire. Find as a function of time: (a) induced emf in the circuit. (b) induced current in the circuit with direction. ( c ) force required on each wire to keep its velocity consatnt. (d) total power required to maintain constant velocity. (e) thermal power developed in the circuit.

in fig. The four rods have λ resistance per unit length. The arrengement is kept in a magnetic field of constant magnitude B and directed perpendicular to the plane of the figure and directing in ward. Initially, the sides as shown form a square. Now each wire starts moving with constant velocity v toward the opposite wire. Find as a function of time: (a) induced emf in the circuit. (b) induced current in the circuit with direction. ( c ) force required on each wire to keep its velocity consatnt. (d) total power required to maintain constant velocity. (e) thermal power developed in the circuit.

A line charge with linear charge density λ is wound around an insulating disc of mass M and radius R A thermocol vessel contains 0.5 kg of distilled water at 30∘ C. A metal coil of area 5×10^−3 m^2 number of turns 100 of radius a pointing up. Now the magnetic field is switched off so that it is free to rotate. In the central region there is a uniform magnetic field B0 which causes the disc to rotate. Find the angular speed with which the disc starts rotating. which is then suspended horizontally as shown in Fig. 3.90