A solenoidal coil has 50 turns er cm along its length and a cross-sectional area of `4 cm^2`. 200 truns of another wire is wound round the first solenoid coaxially. The two coils are electrically insulated from each other. Calculate the mutual inductance between the two coils. given that `mu_0 = 4 pi xx 10^-7 N A^-2`

An air-cored solenoid is of length 0.3 m area of cross-section 1.2 xx 10^-3m^2 and has 2500 turns. Around tis central section, a coil of 350 turns is wound. The soelnoid and the coil are electrically insulated from each other. Calculate the e.m.f. induced in the coil , if the intial current of 3 A in the solenoid is reversed in 0.25 s.

An air core solenoid of 80 cm length has 500 turns and its circular cross-section has a diameter of 2 cm, calculate the self inductance of the solenoid?

A secondary coil of N_2 turns is wound on a long solenoid of cross-section. A and having a primary coil n_1 turns per unit length. What is mutual inductance of the two coils?

A long solenoid of length 1 m, cross sectional area 10 cm^2 , having 1000 turns has wound about its centre a small coil of 20 turns. Compute the mutual inductance of the two circuits. What is e.m.f. in the coil when the current in the solenoid chanages at the rate of 10 As^-1 ?

A conducting wire of 100 turns is wound over 1 cm near the centre of a solenoid of 100 cm length and 2 cm radius having 1,00 turns. Calculate coefficient of mutual inductance of the two solenoids.

Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross sectional area 10cm^2 and length = 20 cm. If one of the solenoids has 300 turns and the other 400 turns, their mutual inductance is

A copper wire of resistivity 1.6xx10^-8 ohm-m has a cross sectional area of 20xx10^-4 cm^2 . Calculate the length of wire required to make a 10 ohm coil.

A small coil is positionaed so that its axis lies along the axis of a large bar agnet, as shown in the figure. The coil has a cross-sectional area of 0.40 cm^2 and contains 150 turns of wire. The average magnetic flux density B through the coil aries with the distance x between the face of the magnet and the plane of the coil as shown in the figure. The coil is 5.0 cm from the face of the magnet to determine the magnetic flux density in the coil.

A solenoid has 2,000 turns wound over a length of 0.3m. the area of its cross-section is 1.2 xx 10^-3 m^2 . Around its central part, coil of 300 is wound. If a initial current of 2A is reversed in 0.25 s, the induced e.m.f. produced in the coil is

A 0.5 m long solenoid has 500 tuns and has a flux density of 2.52 xx 10^-3 T at its centre. Find the current in the solenoid. Given mu_0 = 4pi xx 10^-7 H m^-1