JEE PHYSICS MCQ: CURRENT ELECTRICITY

1 Medium

1 of 1

Application +4 | -1

A current of

16 {~A}

is made to pass through a conductor in which the number density of free electrons is

4 \times 10^{28} {~m}^{-3}

and its area of crosssection is

10^{-5} {~m}^2

. The average drift velocity of free electrons in the conductor is

View answer and explanation

Correct option: A

2.5 \times 10^{-4} {~ms}^{-1}

Option A (

2.5 \times 10^{-4} {~ms}^{-1}

) is correct because it is the result of applying the drift velocity formula using the given values for current, number density, area, and electron charge.

More Questions from CURRENT ELECTRICITY

Practice All Chapter MCQs →

The specific resistance of a wire is

\mathrm{\rho }

, its volume is

3\,\,{\mathrm{m}^3}

and its resistance is

3\,\,\mathrm{\Omega }

, then its length will be Magnitude of drift velocity per unit electric field is Statement-1: If a resistor is connected to a battery the current decreases when the temperature increases.
Statement-2: For most of the resistors, resistance increases with increase in temperature. The reciprocal of resistance is Corresponding to the resistance

4.7\,\, \times \,\,{10^6}\,\,\mathrm{\Omega }\,\, \pm \,\,5\,\,\%

, which is order of colour coding on carbon resistors? In a meter bridge, the gaps are closed by resistance 2 and 3 ohms. The value of shunt to be added to 3 ohm resistor to shift the balancing point by

22.5\,cm