A circular coil of radius 8.0 cm and 20 turns is rotated about its vertical diameter with an angular speed of `50 rad s^-1` in a uniform horizontal magnetic field of magnitude `3.0xx10^-2` . Obtain themaximum and average emf induced in the coil. If the coil forms a closed loop of resistance `10 Omega` , calculate the maximum value of current in the coil. Calculate the average power loss due to Joule heating. Where does this power come from?

An a.c. generator consists of a coil of 2,000 turns each of area 80 cm^2 and rotating at an angular speed of 200 r.p.m. in a uniform magnetic field of 4.8 xx 10^-2 T. Calculate the peak and r.m.s. value of e.m.f induced in the coil.

A circular coil of 30 turns and radius 8.0 cm carrying a current of 6.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 60^@ with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning.

A coil of inductance 8.4 mH and resistance 6 Omega is connected to a 12 V battery. The current in the coil is 1.0 A at approximately time:

A coil of inductance 0.50 H and resistance 100 Omega is connected to a 240 V, 50 Hz ac supply. What is the maximum current in the coil?

A square coil of side 10 cm consists of 20 turns and carries a current of 12 A. The coil is suspended vertically and the normal to the plane of the coil makes an angle of 30^@ with the direction of a uniform horizontal magnetic field of magnitude 0.80 T. What is the magnitude of torque experienced by the coil?

A circular coil of 100 turns radius 10cm, carries a current of 5A. It is suspended vertically in a uniform horizontal magnetic field of 0.5T and the field lines make an angle of 60^(@) with the plane of the coil. The magnitude of the torque that must be applied on it to prevent it from turning.

An a.c. generator consists of a coil of 100 turns and cross sectional area of 3 m^(2) , rotating at a constant angular speed of 60 rad//sec in a uniform magnetic field of 0.04 T. The resistance of the coil is 500 Omega . Calculate max. power dissipation in the coil.

A circular coil of 30 turns and radius 8.0 cm carrying a current of 6.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 60^@ with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning. Would your answer change, if the circular coil in (a) were replaced by a planar coil of some irregular shape that encloses the same area? (All other particulars are also unaltered.)

A circular coil of 50 turns and radius 0.2 cm carries a current of 12 A. Find magnetic field at the centre of the coil.