Figure shows three different orientations of a circular coil rotating in the magnetic field between the poles of a horse shoe magnet.

In which orientation during rotation with uniform angular speed) is the induced e.m.f. greatest?

Figure shows three different orientations of a circular coil rotating in the magnetic field between the poles of a horse shoe magnet. Determine the direction of induced current in the coil, if the rotation is anticlockwise as viewed by the reader.

At which position of the rotating coil in the magnetic field, the induced e.m.f. is maximum?

State the factors on which induced e.m.f. in a coil rotating in a uniform magnetic field depends.

The given figure SAQ 35 shows the positions of a loop PQR in a perpendicular uniform magnetic field. In which position of the coil there is an induced e.m.f.

A magnetic dipole is free to rotate in a uniform magnetic field. For what orientation of the magnet with respect to the field torque is maximum?

A small retangular coil ABCD contains 140 turns of wire. The sides AB and BC of the coil are of length 4.5 and 2.8 cm respectively, as shown in the figure The coil is held between the poles of a large magnet so that the coil can rotate about an axis thorugh its centre. The magnet produces a uniform magnetic field of flux density B between its poles. When the current in the coil is 170 mA, the maximum torque produced in the coil is 2.1 xx 10^-3 N m . For the coil in the position for maximum torque, state whether the plane of the coil is parallel to, or normal to , the direction of the magnetic field.

A small retangular coil ABCD contains 140 turns of wire. The sides AB and BC of the coil are of length 4.5 and 2.8 cm respectively, as shown in the figure The coil is held between the poles of a large magnet so that the coil can rotate about an axis thorugh its centre. The magnet produces a uniform magnetic field of flux density B between its poles. When the current in the coil is 170 mA, the maximum torque produced in the coil is 2.1 xx 10^-3 N m . The current in the coil in (a) is switched off and the coil s positioned as shown in the figure. The coil is then turned thorugh an angle of 90^@ in a time of 0.14 s. Calculate the average e.m.f. induced in the coil.

A small retangular coil ABCD contains 140 turns of wire. The sides AB and BC of the coil are of length 4.5 and 2.8 cm respectively, as shown in the figure The coil is held between the poles of a large magnet so that the coil can rotate about an axis thorugh its centre. The magnet produces a uniform magnetic field of flux density B between its poles. When the current in the coil is 170 mA, the maximum torque produced in the coil is 2.1 xx 10^-3 N m . For the coil in the position shown in the figure. calculate the magnitude of the force on (i) side AB of the coil and (ii) side BC of the coil.