Physics Chapter on Magnetism

A wire carrying a current of 5A is placed perpendicular to a magnetic induction of 2T. The force on each centimeter of the wire is:

If a soft iron piece is buried under the surface of the earth in the north and south direction, then

Force acting on a stationary charge Q in the magnetic field B is –

A proton is moving with velocity 104m/s parallel to the magnetic field of intensity 5Tesla. The force on the proton is

A wire of length ‘l' is placed in a magnetic field ‘B’. If the current in the wire is 'I', then maximum magnetic force on the wire is:

Which of the following statement is correct?

A magnetic field may:

Lenz's law is a consequence of the law of conservation of:

The induced emf produced when a magnet is inserted into a coil does not depend upon:

Lenz's law

A.C. used in our domestic consumption has a frequency

A solenoid having an iron core has its terminals connected across an ideal D.C source. If the iron core is removed, the current flowing through the solenoid is:

Direction of force acting on a current carrying conductor kept in a magnetic field is given by

The unit of induced emf is:

The minimum amount of energy required to emit electrons from a metal surface is called the:

The work function of tungsten coated with barium oxide is nearly:

The electron emitter must have:

A TV tube requires an accelerating voltage of the order:

Electrons were discovered by:

The charge on an atom is:

Isotones of an element have –

An isotones of 32Ge76 is

The triad of nuclei that is isotonic is:

Which particle is used to bombard 13Al28 to give 15P31 and a neutron?