The horizontal telegraph wire `100m` long,oriented along magnetic east west falls freely under gravity to the ground with a speed of 20 cm/s. The horizontal component of earth's magnetic field is `4.0 xx 10^-5` tesla. Find the e.m.f. induced in the wire at the instant the wire strikes the ground.

A meter gauge train is running towards north with speed of 20 m/s .The vertical component of earth's magnetic field is 3 xx 10^_4 (Wb)/m^2 . Calculate the e.m.f. induced at the end of the axle.

A horizontal straight wire 10 m long extending from east to west is falling with a speed of 5.0ms^-1 at right angles to the horizontal component of the earth's magnetic field, 0.30xx10^-4Wb m^-2 What is the instantaneous value of the emf induced in the wire?

A horizontal straight wire 10 m long extending from east to west is falling with a speed of 5.0ms^-1 at right angles to the horizontal component of the earth's magnetic field, 0.30xx10^-4Wb m^-2 What is the direction of the emf?

A metergauge train runs northwards with a constant speed of 22 m/s on a horizontal track.The vertical component of the earth's magnetic field at that place is 3 xx 10^-4 T . the emf induced in its axle is

A horizontal straight wire 10 m long extending from east to west is falling with a speed of 5.0ms^-1 at right angles to the horizontal component of the earth's magnetic field, 0.30xx10^-4Wb m^-2 Which end of the wire is at the higher electrical potential?

A metal conductor of length 1m rotates vertically about one of its ends at angular velocity 5 radians per second. If the horizontal component of earth's magnetic field is 0.2 xx 10^-4T , then the e.m.f. developed between the two ends of the conductor is

A horizontal wire 20 m long extending from east to west is falling with a velocity of 10 m/s normal to the Earth s magnetic field of 0.5 xx 10^-4 T . What is the value of induced emf in the wire?

A Conductor of length 10 cm is moved parallel to itself with a speed of 10 m/s at right angle to magnetic induction 10^_4(Wb)/m^2 . Find the e.m.f. induced in it.

A short bar magnet has magnetic moment 20 Am^2 . The axis of the magnet is in the magnetic meridian with the south pole pointing north. The horizontal component of earth's magnetic field at that place is 3 xx 10^-5 T. Find the point on the axis of the magnet at which the resultant magnetic field is zero, [such a point is called a neutral point].

A cycle wheel with 10 spokes each of length 0.5 m long is rotated at a speed of 18 km//hr in a plane normal to the earth’s magnetic induction of 3.6 xx 10^-5 T . Calculate the e.m.f. induced between the ends of single spoke and ten spokes.