A bar magnet is vibrating in a uniform magnetic induction, the magnitude of which can be changed, its frequency is found to reduce to quarter of the original frequency, when the magnetic induction changes to `1.25 xx10^(-5)` `frac(wb)(m^2)`. Calculate the original magnetic induction.

A bar magnet is vibrating in a uniform magnetic induction, the magnitude of which can be changed. If the frequency is found to reduce to half of its original frequency when the magnetic induction changes to 1.25xx10^(-5) frac(wb)(m2) . Calculate the original magnetic induction.

When a current carrying coil is suspended in. uniform magnetic induction B, the magnitude of torque acting on it is given by

The torque acting on a magnetie dipole of moment 5 A m^(2) when placed in an external uniform magnetic induction 1.5 xx 10^(-4)" Wb/m"^(2) at right angle to magnetic induction is

A bar magnet of moment 2 Am^2 and having a moment of inertia 10^-6 kg-m^2 about a transverse axis passing through its centre is performing S.H.M in a magnetic induction 0.8xx10^-(5)frac(wb)(m^2) . Calculate the period of the bar magnet.

The vertical and horizontal components of the earth's magnetic induction at a place are 2 xx 10^-5 T respectiveley. Calculate dip and the magnitude of the earth's magnetic induction at that place.

A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian, has its north tip pointing down at 21^@ 48^1 with the horizontal. If the horizontal component of the earth's magnetic induction at that place is 3.5 xx 10^-5 T, determine the earth's magnetic induction at that place.

A conductor of length 0.3 m moves with a uniform velocity of 10 m//s at right angles to the magnetic field of induction 0.5 xx 10^-4 Wb//m^2 . Calculate the e.m.f. induced in it.

A coil of 100 turns and area 2 xx 10^(-2) m^(2) , pivoted about a vertical diameter in a uniform magnetic field carries a current of 5A . When the coil is held with its plane in North-South direction, it experiences a torque of 0.3 N//m . When the plane is in East-West direction the torque is 0.4 Nm . The value of magnetic induction is (Neglect earth's magnetic field)

The magnetic flux through a coil is 5 xx10^-4 Wb at time t = 0. It reduces to ten percent of its original value in 0.5s. The magnitude of e.m.f. induced in the coil is

The magnetic flux linked with a coil changes from 12xx10^-3 Wb to 6xx10^-3 Wb in 0.01 second. Calculate the induced emf.