A moving coil meter has the followig particulars. The number of turns n = 24, area of coil, A = `2.0 xx 10^-3m^2` magnetic field strength, B = 0.20 T and resistane of the coil, R = 14 ohm Indicate a simple way to increase in current sensitivity of the meter by 25%

A galvanometer coils is 2 cm square and contains 100 turns. Its period is 20 s and its moment of inertia is 2 g cm^2 . The field of the magnet is 0.2 T. Determine the current sensitivity of the galvanometer?

Two moving coil meters, M_1 and M_2 have the following particulars: R_1 = 10Omega , N_1 = 30. A_1 = 3.6 xx 10^-3 m^2 , B_1 = 0.25 T R_2 = 14Omega , N_2 = 42, A_2=1.8Xx10^-3 m^2 , B_2 =0.50T (The spring constants are identical for the two meters). Determine the ratio of current sensitivity

Two moving coil meters, M_1 and M_2 have the following particulars: R_1 = 10Omega , N_1 = 30. A_1 = 3.6 xx 10^-3 m^2 , B_1 = 0.25 T R_2 = 14Omega , N_2 = 42, A_2=1.8Xx10^-3 m^2 , B_2 =0.50T (The spring constants are identical for the two meters). Determine the ratio of voltage sensitivity of M_2 and M_1 .

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 maximum current drawn from the generator.

A coil containing 20 turns of average diameter 0.02 m is placed perpendicular to a magnetic field of intensity 1.6 xx 10^4 T . The magnetic field changes to 1.8 xx 10^3 T in 4 s. A resistor of resistance 15 ohm is connected in sereis with the coil. If the resistance of the coil is 5 ohm, find the induced current passing through the resistor.

A circular coil of 200 turns and radius 0.2 m carries a current of 14 A. What is the magntitude of magnetic moment associated with the coil?

A rectangular coil of N turns and ara of cross-section A is held in a time-varying field given by B = B_0 cosomegat , with the plane of the coil noral to the magnetic field. Deduce an expression for the e.m.f. induced in the coil.

Calculate the torque on a 50 turn circular coil of radius 10 cm, when placed with its plane at 60^@ with a magnetic field of 3.1 xx 10^-5 T . The current through the coil is 2 A.

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 N turns and radius R is kept normal to the magnetic field given by B = B_0 cos omegat . Deduce an expression for e.m.f. induced in the coil. State the rule which helps to detect the direction of induced current.