What are conductors?

What are semi-conductors ? How are they formed ?

What are semi-conductors ? Describe the two main types of semi- conductors.

What is the field in the cavity if a conductor having a cavity is charged? Does the result depend on the shape and size of cavity or conductor ?

A straight wire of lengt 2m is kept horizontla in a uniform magnetic field of induction 4xx10^(-3)Wb//m^(2). The field is horizontal and is at right angles to the length of the conductor. It is found that the conductor remains balanced, if a current of 4.9 A is passed through the conductor. What is the mass of the wire ?

What are super-conductors? Write their two applications.

What are good and bad conductors of heat? Give examples.

According to energy band diagram, what makes a substance conductor insulator?

What is meant by poor conductors of heat (or insulators of heat) ? Give two examples of materials which are poor conductors of heat (or insulators).