If the torsional rigidity per unit angle of twist of the suspension of the coil is k, find out an expression for the current sensitivity of galvanometer.

Find out the expression for rms current for AC current form?

What do you mean by current sensitivity of a galvanometers ? Write its SI unit.

Find out the energy stored in a coil of self inductance L due to a current I through it.

The resistances of a galvanometer is 200 Omega and full-scale deflection is obtained for a current of 5mA. The galvanometer is connected with a source of electricity through a resistance of 58 Omega in series. The emf of the cell is 30V and its internal resistance is negligibly small .Find out the resistance of the shunt that should be connected with the galvanometer in parallel.

A slab of material of dielectric constant k has the same area as that of the plates of a parallel plate capacitor but has the thickness d/2, when d is the separation between the plates. Find out the expression for its capacitance when the slab is inserted between the plates of the capacitor.

If the current sensitivity of a moving coil galvanometer is increased by 20% , its resistance also increased by 1.5 times. How will the voltage sensitivity of the galvanometer by affected?

A metallic rod of mass per unit length 0.5 kg cdot m^(-1) is lying horizontally on a smooth inclined plane which makes an angle of 30^(@) with the horizontal. The rod is not allowed to slide down flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is

A wire AB is carrying a steady currents of 12 A and is lying on a table. Another wire CD carrying 5A is held directly above BA at a height of 1 mm. Find the mass per unit length of the wire CD so that it remains suspended at its position when left free. Give the direction of the current flowing in CD with respect to that in AB. [Take the value of g=10 m*s^(-2)]

What does a toroid consist of ? Find out the expression for the magnetic field inside a toriod for N turns of the coil having an average radius r and carrying current I. show that the magnetic field in the open space inside and outside the torroid is zero.