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.

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

An iron rod of volume 10^(-4) m^(3) and relative permeability 900 is placed inside a long solenoid wound with 6 turns/cm. If a current of 0.4 A is passed through the solenoid, the magnetic moment of the rod is

A solenoid has length 0.4cm , radius 1 cm and 400 turns of wire. If a current fo 5 A is passed through this solenoid, then what is the magnetic field inside the solenoid?

The coercive force for a certain prmanent magnet is 4.0 xx 10^4 A m^(-1) . This magnet is placed inside a long solenoid of 40 turns/cm and a current is passed in the solenoid to demagnetize it completely. Find the current.

An iron rod of length 20 cm and diameter 1 cm is placed inside a solenoid on which the number of turns is 600.The relative permeability of the rod is 1000.If a current of 0.5 A ios placed in the solenoid,then magnetisation of the rod will be

The coercive force for certain permanent magnet is 2times10^(4)A/m .This magnet is placed inside a long solenoid of 40 turns/cm and a current is passed in the solenoid to demagnetize the magnet.The value of current (in A) is

The B-H curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with 1000 turns/cm. The current that should be passed in the solenoid to demagnetise the ferromagnet completely is :

A short solenoid of length 4 cm, radius 2 cm and 100 turns is placed inside and on the axis of a long solenoid of length 80 cm and 1500 turns. A current of 3 A flows through the short solenoid. The mutual inductance of two solenoid is

The coercivity of a certain permanent magnet is 4.0xx10^(4)Am^(-1) . The magnet is placed insider a solenoid 20cm long having 700 turns and a current is passed in the solenoid to demagnetise it completely. Find the current