When no current is passed through a conductor,
(a) | the free electrons do not move. |
(b) | the average speed of a free electron over a large period of time is zero. |
(c) | the average velocity of a free electron over a large period of time is zero. |
(d) | the average of the velocities of all the free electrons at an instant is zero. |
Choose the correct option:
1. (a) only
2. (b), (c)
3. (c), (d)
4. (a), (d)
1. | current density | 2. | current |
3. | drift velocity | 4. | electric field |
A charged particle having drift velocity of \(7.5\times10^{-4}~\text{ms}^{-1}\) in an electric field of \(3\times10^{-10}~\text{Vm}^{-1}\), has mobility of:
1. \(2.5\times 10^{6}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
2. \(2.5\times 10^{-6}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
3. \(2.25\times 10^{-15}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
4. \(2.25\times 10^{15}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)