Magnetic effect...

A long magnetic needle of length L, having a magnetic moment M and pole strength m units, is broken into two at the middle. The magnetic moment and the pole strength of each piece will respectively be

Magnetic field is not associated with

A vertical wire carries a current upwards. The magnetic field at a point due north of the wire is directed

ABCD is a square loop made of a wire having uniform resistivity. A current enters the loop at A and leaves at D. The magnetic field is

AB and CD are long straight conductors, distance d apart, carrying a current I. The magnetic field on BC due to the current in AB and CD

A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then

A diamagnetic material in a magnetic field moves

Materials suitable for making electromagnets should have

A square loop is made by a uniform conductor wire as shown in the figure:



What is the net magnetic field at the centre of the loop, if side length of the square is 'a'?

Two parallel wires carry current in opposite directions. They will

An electron moving with a uniform velocity along the positive x-direction enters a magnetic field directed along the positive y-direction. The force on the electron is directed along

_{The figure shows three situations when an electron with velocity travels through a uniform magnetic field . In each case, what is the direction of magnetic force on the electron?}

The north pole of a magnet is brought near a metallic ring as shown in the figure. The direction of induced current in the ring will be

The following diagram represents the construction of an ac generator. If the coil rotates in clockwise direction,

In the arrangement shown in the given figure, there are two coils wound on a non-conducting cylindrical rod. Initially the key is not inserted. Then the key is inserted and later removed. Then,

An electron and a proton enter a magnetic field with equal velocities. Which one of them experiences more force?

Magnetism in a magnet is mainly due to

The two ends of a horizontal conducting rod of length l are joined to a voltmeter. The whole arrangement moves with a horizontal velocity u, the direction of motion being perpendicular to the rod. The vertical component of earth's magnetic field is B. The voltmeter reading is .....

A geyser of 2.5 KW is connected to a battery of 220 volts. An iron of 1.5 KW is also connected to the battery. To prevent any failure of fuse, the fuse wire must have a current rating of

A stream of electrons is projected horizontally to the right. A straight current carrying conductor is supported parallel to the electron stream and above it. If the direction of current in the conductor is from left to right, what will be the effect on the electron stream?