- 1(current)
Q. No.A copper wire of radius \(1\) mm contains \(10^{22}\) free electrons per cubic metre. The drift velocity for free electrons when \(10\) A current flows through the wire will be:
(Given, charge on electron = \(1.6\times10^{-19}\) C)
1. \(\dfrac{6.25\times10^4}{\pi}\) m/s
2. \(\dfrac{6.25}{\pi}\times10^3\) m/s
3. \(\dfrac{6.25}{\pi}\) m/s
4. \(\dfrac{6.25\times10^5}{\pi}\) m/s
(Given, charge on electron = \(1.6\times10^{-19}\) C)
1. \(\dfrac{6.25\times10^4}{\pi}\) m/s
2. \(\dfrac{6.25}{\pi}\times10^3\) m/s
3. \(\dfrac{6.25}{\pi}\) m/s
4. \(\dfrac{6.25\times10^5}{\pi}\) m/s
Subtopic: Â Current & Current Density |
 71%
From NCERT
NEET - 2023
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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) |
Subtopic: Â Current & Current Density |
 56%
From NCERT
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Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity which remains constant along the conductor is:
| 1. | current density | 2. | current |
| 3. | drift velocity | 4. | electric field |
Subtopic: Â Current & Current Density |
 59%
From NCERT
NEET - 2015
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A copper wire of length \(10\) m and radius \(\left({10^{-2}/\sqrt{\pi}}\right)\) m has an electrical resistance of \(10~\Omega.\) The current density in the wire for an electric field strength of \(10\) (V/m) is:
1. \(10^{5}\) A/m2
2. \(10^{4}\) A/m2
3. \(10^{6}\) A/m2
4. \(10^{-5}\) A/m2
1. \(10^{5}\) A/m2
2. \(10^{4}\) A/m2
3. \(10^{6}\) A/m2
4. \(10^{-5}\) A/m2
Subtopic: Â Current & Current Density |
 66%
From NCERT
NEET - 2022
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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. \(2.25\times 10^{15}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
Subtopic: Â Current & Current Density |
 82%
From NCERT
NEET - 2020
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- 1(current)
Q. No.
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