Current Electricity

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

Electricity, Electric Current, Unit, Direction (Part-1)

Define electric current. What is its SI unit?

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

Differentiate between : Nerve impulse and Electric current.

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