Current electricity

Name the instrument used to measure the current in an electric circuit.

Name the instrument used to control current in an electric circuit.

Two parallel wires are carrying electric currents of equal magnitude and in the same direction. They

A coil carrying electric current is placed in uniform magnetic field

In an electrolytic solution the electric current is mainly due to the movement of free electrons.

A:Current density is a very is a vector quantity . R : Electric current , passing through a given unit area is current density.

(A) : A galvanometer can be used as an ammeter and Voltmeter. (R) : A galvanometer cannot be used in electric circuit to detect the direction of electric current.

A wire whose cross-sectional area is increasing linearly from its one end to the other, is connected across a battery of V volts. Which of the following quantities remains constant in the wire ? (a) drift speed , (b) current density (c ) electric current , (d) electric field. Justify your answer.

You are facing a circular wire carrying an electric current. The current is clockwise as seen by you. Is the field at the centre coming towards you or going away from you?

A large metal sheet carries an electric current along its surface. Current per unit length is lambda . Magnetic field near the metal sheet is.