When current is allowed to flow through a coil of wire, the coil

A magnetic needle is arranged at the centre of a current carrying coil having 50 turns with radius of coil 20 cm arranged along magnetic meridian. When a current of 0.5mA is allowed to pass through the coil the deflection is observed to be 30^(@) . Find the horizontal component of earth's magnetic field

Two coils P and Q are kept near each other. When no current flows through coil P and current increases in coil Q at the rate 10 A//s , the emf in coil P is 15 mV. When coil Q carries no current and current of 1.8 A flows through coil P, the magnetic flux linked with the coil Q is

A current of 2.5 A flows through a coil of inductance 5 H. The magnetic flux linked with the coil is

A current of 2 ampere is flowing through a coil of radius 0.1 m and having 10 turns. The magnetic moment of the coil will be :

A current of 6A flows through a coil when connected to a 24 volt d.c. supply. To get the same current with a 50 Hz a.c. supply, the voltage required is 30 V. What is the power factor of the coil?

A coil is suspended in a uniform magnetic field, with the plane of the coil parallel to the magnetic lines of force. When a current is passed through the coil it starts oscillating, It is very difficult to stop. But if an aluminium plate is placed near to the coil, it stops. This is due to :