A magnet whose magnetic property is due to the flow of an electric current through it

Electricity can flow through :

The magnetism of a bar magnet is due to

The direction of the flow of current through electric circuit is

Through an electrolyte an electrical current is due to drift of

The velocity of Electro Magnetic wave depends A. only upon the electric properties of the medium B. only upon the magnetic properties of the medium C. both upon the electric and magnetic properties of the medium D. mechanical and thermal properties of the medium:

(A) : Free electrons always keep on moving in a conductor even then no magnetic force act on them in magnetic field unless a current is passed through it. (R) : The average velocity of free electron in a conductor is zero in the absence of the electric field in it.

Write an expression for the electrical energy spent in the flow of current through an electrical appliances in terms of I, R and t.

The magnetic field produced around a straight line wire when current flows through it is

Assertion: Substances which at room temperature retain their ferromagnetic property for a long period of time are called permanent magnets. Reason: permanent magnet can be made by placing a ferramagnetic rod in a solenoid and passing current through it.

The magnetic field at the origin due to the current flowing in the wire is