In any network of wires carrying currents, the algebraic sum of all currents meeting at a point is equal to

In half wave rectifiers, diode conducts during

A. Only positive half cycle

B. Only negative half cycle

C. Both positive and negative half cycle

D. Neither in positive half cycle nor in negative half cycle

Specific resistance of a material is

A. Directly proportional to the both area of cross section and length of material

B. Directly proportional to the area of cross section and inversely proportional to the length of material

C. Inversely proportional to the area of cross section and directly proportional to the length of material

D. Inversely proportional to the both area of cross section and length of material

Which among the following is true about ohm’s law?

A. I ∝ V

B. I = V/R

C. V = IR

D. All of these

Electrical appliances which works on the electromagnetic principle is / are

A. Generators

B. Motors

C. Transformers

D. All of these

The materials with permeability less than unity are called

A. Diamagnetic materials

B. Paramagnetic materials

C. Ferromagnetic materials

D. Anti ferromagnetic materials