Through a coil of radius 3 cm and 25 turns, a current is passed so as to produce a magnetic induction of `10pi xx 10^-5 wb//m^2`, at a point distant 4 m from the centre of the coil on its axis. Find the current.

The number of turns in a circular coil of wire is 10 and average radius of each turn is 8 cm. A current of 5A is passed through the coil. Find the magnetic induction due to the current at a point at a distance of 6 cm on the axis of the coil from the centre.

The bar magnet produces magnetic induction of 4 xx 10^(-5)T at a point 10 cm from centre on the axis of magnet. The magnetic moment is The bar magnet produces magnetic induction

A solenoid 0.5 m long has a four layer winding of 300 turns each. What current must pass through it to produce a magnetic field of induction 2.1 xx 10^-2 T at its centre?

The magnetic induction at a point distant 15 cm on the axis of a short bar magnet of moment 0.5 A m is

The magnetic induction at the centre of a current carrying circular coil of radius 10cm is 5sqrt(5) times the magnetic induction at a point on its axis. The distance of the point from the centre of the coil in m is

A current of 10A passes through a coil having 5 turns and produces a magnetic field of magnitude. 5 xx 10^-4T at th e centre of the coil. Calculate the diameter of the coil.

A 50 m long solenoid has 500 turns and produces a magnetic field of 2.5 xx 10^-4 T at its centre. Find the current in the solenoid.

Calculate the magnetic moment of a short magnet which produces magnetic induction of 10^-3 T, at a point along its axis at a distance of 20 cm from its centre [ mu_o = 4pi xx 10^-7 SI unit].

A rectangular coil of length 0.5m and breadth 0.2m has a resistance of 10 Omega . The coil is placed in magnetic induction of 0.05 Wb/m^2 and its direction is perpendicular to the plane of the coil.If the magnetic induction is uniformly reduced to zero in time 10 second, find the e.m.f . and current induced in the coil.

A very long straight wire carries a current of 5A. The magnetic induction at 0.1m from the wire is 1 xx 10^-5 wb//m^2 . What will be the magnetic induction at 0.5m from the wire of the current through the wire is increased to 20A?