A current of 1 mA is flowing through a copper wire. How many electrons will pass a given point in one second
1.
2.
3.
4.
The drift velocity of free electrons in a conductor is \(v\) when a current \(i\) is flowing in it. If both the radius and current are doubled, then the drift velocity will be:
1. | \(v\) | 2. | \(\dfrac{v}{2}\) |
3. | \(\dfrac{v}{4}\) | 4. | \(\dfrac{v}{8}\) |
Drift velocity \(v_d\) varies with the intensity of electric field as per the relation:
1. \(v_{d} \propto E\)
2. \(v_{d} \propto \frac{1}{E}\)
3. \(v_{d}= \text{constant}\)
4. \(v_{d} \propto E^2\)
In a conductor 4 coulombs of charge flows for 2 seconds. The value of electric current will be :
(1) 4 volts
(2) 4 amperes
(3) 2 amperes
(4) 2 volts
Through a semiconductor, an electric current is due to drift off:
(1) Free electrons
(2) Free electrons and holes
(3) Positive and negative ions
(4) Protons