`300` turns of a thin wire are uniiformly wound on a permanent manet shaped as a cylinder of length `15cm`. When a current `3A` is passed through the wire, the field outside the magnet disappears. Then the coercive force of the material is

N = 300 turns of thin wire are uniformly wound on a permanent magnet shaped as a cylinder whose length is equla to l = 15 cm . When a current I = 3.0 A was passed through the wring the field outside the magnet disappeared. Find the coercive force H_(e) of the materail from which the magnet was manufaucured.

When current is passed through a wire wound around an iron rod, it produces

A current is passed through a straight wire the magnetic field established around it has its lines of force

A current is passed through a straight wire. The magnetic field established around it has its lines of forces

A wire of length L is shaped into a circle and then folded as shown. Magnetic moment of the frame when a current i is passed through it is:

When a wire is wound around a soft iron bar, and a current is passed through it, the soft iron bar behaves like a magnet.

A permanent magnet in the shape of a thin cylinder of length 10cm has M=10^6 A//m . Calculate the magnetisation current lm……

A permanent magnet in the shape of a thin cylinder of length 50 cm has intensity of magnetisaton 10^(6)Am^(-1) . The magnetisation current is

A permanent magnet in the shape of a thin cylinder of length 50 cm has intensity of magnetisaton 10^(6)Am^(-1) . The magnetisation current is