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?

A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil?

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.

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%

The coil of a galvanometer is 0.02 xx 0.06 m^2 . It consits of 200 turns of fine wire and is in a magnetic field of 0.2 tesla. The restoring torque constant of the suspension fibre is 10^-6 N m per degree. Assuming the magnetic field to be radial. What is the maxium current that can be measured by this galvanometer, if the scale can accommodate 30^@ deflection?

Two tangent galvanometers have circular coils of same radii differing only in the number of turns. They are connected in series. WHen a a steady current is passed in the circuit, the mean deflections of galvanometer are theta_1 and theta_2 . deduce an expression for the ratio of number of turns of the galvanometer.

The magnetic field due to a current carrying loop of radius 3 cm at a point on axis at a distance of 4 cm from its centre of 54 mu T . Then , the value of the magnetic field at the centre of the loop is

The surface area of a cuboid is 1300cm^2 . If its length is 15 cm and height is 20 0cm, find its breadth.

The coil of a galvanometer is 0.02 xx 0.06 m^2 . It consits of 200 turns of fine wire and is in a magnetic field of 0.2 tesla. The restoring torque constant of the suspension fibre is 10^-6 N m per degree. Assuming the magnetic field to be radial.What is the smallest current that can be detected, if the minimum observable deflection is 0.1^@ ?

Calculate the current in a circular coil of radius 5 cm and 100 turns to produce a field of 2 xx 10^-5 T at its centre.