Tag: electric current, potential difference and resistance
Questions Related to electric current, potential difference and resistance
If temperature is decreased, then relaxation time of electrons in metals will
A potential difference V is applied across a copper wire of diameter d and length L. when only d is doubled, the drift velocity :-
The drift velocity of electrons in a conducting wire is of the order of $1:mm/s$, yet the bulb glows very quickly after the switch is put on because
A potential difference v exists between the ends of a metal wire of length l. The drift velocity will be doubled if
Assertion : A current flows in a conductor only when there is an electric field within the conductor.
Reason : The drift velocity of electron in presence of electric field decreases.
The electron drift speed is small and the charge of the electron is also small but still, we obtain large current in a conductor. This is due to
Two wires, each of radius r, but of different materials are connected together end to end. If the densities of charge carriers in the two wires are in the ratio 1:4, the ratio of the drift velocity of electrons in the two wires will be . .
The drift velocity of an electron is doubled if the applied electric field across the conductor is .....
When there is an electric current through a conducting wire along its length then an electric field must exist
Copper contains $8.4\times 10^{28}$ free electrons$/m^3$. A copper wire of cross-sectional area $7.4\times 10^{-7}m^2$ carries a current of $1$A. The electron drift speed is approximately.