An air cored solenoid with length 30 cm, area of cross section `25 cm^2` and number of turns 500, carries a current of 2.5A. The current is suddenly switched off in a brief time of `10^-3s.`How much is the average back emf induced across the ends of the open switch in the circuit? Ignore the variation in magnetic field near the ends of the solenoid.

A solenoid of length 100 cm having 150 turns carries a current of 3A. Find the magnitude of magnetic field:- at one end of solenoid.

A solenoid is 2 m long and 3 cm in diameter. It has 1000 turns and carries a current of 5A. Magnetic field at the centre is

A closely wound solenoid of 800 turns and area of cross section 2.5 xx 10^-4 m^2 carries a current of 3.0 A. Explain the sense in which the solenoid acts like a bar magnet. What is its associated magnetic moment ?

A circular coil of 500 turns and area of 0.5 cm^2 carries a current of 10 A. The magnetic moment associated with it_______.

A long solenoid consisting of 1.5xx10^3 turns//m has an area of cross-section of 25 cm^2 . A coil C, consisting of 150 turns (N_c) is wound tightly around the centre of the solenoid. Calculate for a current of 3.0 A in the solenoid (a) the magnetic flux density at the centre of the solenoid, (b) the flux linkage in the coil C, (c) the average emf induced in coil C if the current in the solenoid is reversed in direction in a time of 0.5 s. (mu0=4pixx10^-7 T.m//A) .

A closely wound solenoid of 2000 turns and area of cross-section 1.6 xx 10^-4 m^2 ,carrying a current of 4.0 A,is suspended through its centre allowing it to turn in a horizontal plane. What is the magnetic moment associated with the solenoid ?

A closely wound solenoid of 2000 turns and area of cross-section 1.6 xx 10^-4 m^2 ,carrying a current of 4.0 A,is suspended through its centre allowing it to turn in a horizontal plane. What are the force and torque on the solenoid if a uniform horizontal magnetic field of 7.5 xx 10^-2 T is set up at an angle of 30^@ with the axis of the solenoid ?

A closely wound solenoid of 1000 turns and area of cross-section 2 xx 10^-4 m^2 carries a current of 1 A. It is placed in horizontal axis at 30^@ with the direction of uniform magnetic field of 0.16 T. Calculate magnetic moment of solenoid and torque experienced by the solenoid due to the field.