A rectangular coil of effective area `0.01 m^2` suspended freely in a radial magnetic field. The coil deflects through `30^@` when current of `0.5 xx 10^-3 A` is passed through it. If torsional constant of suspension is `25 xx 10^-9 Nm//rad`. Find 'B' magnetic induction.

A rectangular coil of effective area 0.04 m^2 is suspended freely in a radial magnetic field 1 xx 10^2 Wb//m^2 . When a current of 5 mA is passed through the coil, it deflects through 60^@ ? Find the torsional constant of the suspension fibre.

A rectangular coil of effective area 0.05 m^2 is suspended freely in a radial field of 0.01 Wb//m^2 .If the torsional constant of suspension fibre is 5 xx 10^-9 N//m per degree, find the angle through which the coil rotates when a current of 300 muA is passed through it.

A rectangular coil of 10 turns and effective area 0.05 m^2 is freely suspended in a radial field of induction 0.01Wb/m^2 . If the torsional constant of suspension fibre is 5 xx 10^-9 Nm/degree , find the angle through which the coil rotates when a current Of 30 mu A is passed through it

A rectangular coil has 100 turns has length 5 cm and breadth 2 cm. It is suspended in radial magnetic field of induction 0.1 Wb//m^(2) . If a current of 100 muA is passed through the coil, then the torque acting on the coil is

Find the heat produced in joule if a current of 0.1 A is passed through a coil of resistance 25 ohm for one minute.

A circular coil of conducting wire has 500 turns and an area 1.26 xx 10^-4 m^2 is enclosed by the coil. Calculate the magnetic moment of the coil if a current of 100 muA is passed through.

A bar magnet of magnetic moment 200 A-m^(2) is suspended in a magnetic field of intensity 0.25 N//A-m . The couple required to deflect it through 30^(@) is

A moving coil galvanometer has been fitted with a rectangular coil having 50 turns and dimensions 5 cmi xx 3 cm . The radial magnetic field in which the coil is suspended is of 0.05 wb//m^2 . The torsional constant of the spring is 1.5 xx 10^-9 Nm//degree . Obtain the current required to be passed through the galvanometer so as to produce a deflation of 30^@ .

A coil of effective area 10m^2 is placed at right angles to a magnetic field of induction 0.05 T. Find the induced emf in the coil if just the magnitude of the field is changed to 0.03T in 0.2s.