Electricity

Electrons are ALWAYS present in every material.

What is the charge of an electron?

The nearer the electron from the nucleus, the higher its energy level.

Who improved Bohr’s atomic model?

Materials with exactly 4 valence electrons.

The region where free electrons are said to be present

A positive electric charge can be destroyed by a negative electric charge.

Electronegative elements give up electrons to produce negative ions.

When two or more charges exert forces simultaneously on another charge, the total force acting on the charge is the vector sum of the individual forces exerted by each charge. This is known as the:

For any closed system, the total electric flux passing through that surface is:

In Gauss’s law, the electric field E MUST BE normal or perpendicular to the Gaussian surface.

What is the unit of electrical potential difference?

The production of electric current, potential or voltage due to magnetism is called:

The more domains aligned, the stronger is the magnetic field.

At saturation point, almost all domains are already aligned. So further increase in the magnetizing force will:

What is the source of magnetic fields:

Nonmagnetic materials ______ magnetism to pass through them.

It is used to make powerful permanent magnets. Very hard and difficult to machine; usually cast in their final shape; subject to strict procedure of heat and magnetic field treatment.

19. ALL ferromagnetic materials have hysteresis loops.
Temporary magnets have low retentivity.

The flux that does not follow to its intended path in a magnetic circuit.

What is the reciprocal of reluctance?

What is the symbol for magnetic circuit’s flux density?

The concept whereby a small voltage is generated by a conductor with current in an external magnetic field is known as:

Coulomb is the SI unit of charge, how about cgs?

Find the dielectric constant of air.