Electric Current & Drift Velocity: JEE Questions & Solutions

A cylindrical conductor of length 2 m and area of cross-section 0.2 mm^2 carries an electric current of 1.6 A when its ends are connected…

A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is 91.6, then the loss of power in units of cal/s is

Current passing through a wire as function of time is given as I(t)=0.02 t+0.01 ~A. The charge that will flow through the wire from t=1 ~s…

A current of 200 A deflects the coil of a moving coil galvanometer through 60^. The current to cause deflection through /10 radians is:

The electric current through a wire varies with time as I = I0 + t, where I0 = 20 A and = 3 A/s. The amount of electric charge that crosses…

The charge flowing in a conductor changes with time as Q(t) = t - t^2 + t^3, where,, are constants. The minimum value of current is:

The drift velocity of electrons for a conductor connected in an electrical circuit is Vd. The conductor is now replaced by another…

The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by 50. The percentage…

A current of 2 A through a wire of cross-sectional area 25.0 mm^2. The number of free electrons in a cubic meter is 2.0 10^28. The drift…

Given below are two statements: Statement I: If the number of turns in the coil of a moving coil galvanometer is doubled, then the current…

In a metallic conductor, under the effect of applied electric field, the free electrons of the conductor: