Current electricity

(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.

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

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

A : When a steady current flows through a conductor of non - uniform cross-section , the current density , electric field and drift velcoity do not remain constant. R : For a constant current the current density electric field and drift velocity are inversely proportional to cross - sectional area.

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

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

A coil carrying electric current is placed in uniform magnetic field

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

How does electric current flow along a conductor , when electric field is applied along the length of conductor ?

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.