A TG has 50 turns each of diameter `15 cms`. When a certain current is passed through its coil, the deflection of the needle is `45^(@)`. If `B_H)=4 pi muT` the value of current is

When current is passed through the conductor, the compass needle deflects. Why?

A tangent galvanometer propertly adjusted gives a deflection of 30^(@) when a certain current is passed through it. When the current is changed, then it gives a deflection of 45^(@) . The ratio of the currents in the two cases is

A circular coil has 63 turns, each of radius 22cm. It is placed in the magnetic meridian. A current of 0.5A is passed through the coil. What is the deflectio of a compass needle placed at its center is 45^(@) . Calcualte the intensity of the earth's horizontal field.

The coil in a MCG has an area of 4cm^(2) and 500 turns. The intensity of magnetic induction is 2T . When a current of 10^(-4)A is passes through it, the deflection is 20^(@) . The couple per unit twist is (N-m)

When current passing through a coil is made doubled, its self inductance ......

When current is passed through a tangent galvanometer there is no deflection of the needle . If current is reversed , the rotates by 180^(@) . Then the plane of the coil will be .

A short bar magnet oscillates in VMM with a frequency of 10Hz. If a downward current of 15A is established in a long thin vertical wire placed 20 cm west of the magnet, its frequency was found to be 5Hz. If a TG containing 500 turns with radius of each turn 4pi cm is used at that place & a current of 10mA is allowed to pass through it. Find the deflection of magnetic needle in the TG