An iron rod of length 0.5 m, radius 0.02 m having relative permeability 120 is placed inside a long solenoid carrying a current of 0.8 A. If the solenoid has 250 turns `m^-1`, find the intensity of magnetisation

An iron rod of length 0.5 m, radius 0.02 m having relative permeability 120 is placed inside a long solenoid carrying a current of 0.8 A. If the solenoid has 250 turns m^-1 , find the magnetic dipole moment acquired by the iron rod.

An iron rod of volume 10^-4m^3 and relative permeability 1000 is placed inside a long solenoid wound with 5 turns/cm. If a current of 0.5A is passed through the solenoid, find the magnetic moment of the rod.

A copper rod of length 0.18 m is moving with a uniform velocity 10 ms^-1 parallel to a long straight wire carrying a current of 5.0 A. The rod itself is perpendicular to the wire with its ends at distances 0.01 m and 0.2 m from it. Calculate the e.m.f. induced in the rod.

A solenoid of length 1 m and 3 cm in diameter has five layers of winding of 850 turns each and carries a current of 5 A. What is the magnetic field thorugh a cross-sectional end of the solenoid of the solenoid at its centre.

Mangetic field intensity at the centre of a coil of 50 turns, radius 0.5 m and carrying a current of 2 A is

Figure shows a short solenoid of length 4 cm, radius 2.0 cm and number of turns 100., lying inside on the axis of a long solenoid, 80 cm long and number of turns 1,500. What is the flux through the long solenoid, if a current of 5.0 A flows through the short solenoid? Also obtain the mutual inductance of the two solenoids.

A 3.0 cm wire carrying a current of 10 A is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 0.27 T. What is the magnetic force on the wire?

A long solenoid with 15 turns per cm has a small loop of area 2.0 cm^2 placed inside the solenoid normal to its axis. If the current carried by the solenoid changes steadily from 2.0 A to 4.0 A in 0.1 s, what is the induced emf in the loop while the current is changing?