A loop `PQR` formed by three identical uniform conducting rods each of length `a` is suspended from one of its vertices `(P)` so that it can rotate about horizontal fixed smooth axis `CD`.Initially plane of loop is in vertical plane.A constant current `i` is flowing in the loop.Total mass of the loop is `m` At `t=0`,a uniform magnetic field of strength `B` directed vartically upwards is swiched on.Acceleration due to gravity is `g` then Find the minimum valeu of `B` so that the plane of the loop becomes horizontal (even for an instant)during its subsequent motion.

Current loop in a uniform magnetic field

There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then

A conducting loop carrying a current I is placed in a uniform magnetic field ponting into the plane of the paper as shown. The loop will have a tendency to

L is a smooth conducting loop of radius l=1.0 m & fixed in a horizontal plane.A conducting rod of mass m=1.0 kg and length slightly greater than l higed at the centre of the loop can rotate in the horizontal plane such that the free end slides on the rim of the loop.There is a uniform magnetic field of strength B=1.0 T directed vertically downward.The rod is rotated with angular velocity omega_(0)=1.0 rad//s and left.The fixed end of the rod and the rim of the loop are connected through a battery of e.m.f E a resistance R=1 Omega , and initially uncharged capacitor of capacitance C=1.0 F in series.Find (i)the time dependence of e.m.f M such that the current I_(0)=1.0 A in the circuit is contant. (ii)energy supplied by the battery by the time rod stops.

A circular wire loop of radius r lies in a uniform magnetic field B, with its plane perpendicular to magnetic field. If the loop is deformed to a square shape in the same plane in time t, the emf induced in the loop is