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Q. No.The plot of current \(I~\text{(A)}\) flowing through a metallic conductor versus the applied voltage \(V~\text{(volt)}\) across the ends of a conductor is:
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2. |  |
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4. |  |
Subtopic: Derivation of Ohm's Law |
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NEET - 2022
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A certain wire \(A\) has resistance \(81\) \(\Omega\). The resistance of another wire \(B\) of the same material and equal length but of diameter thrice the diameter of \(A\) will be:
| 1. | \(81\) \(\Omega\) | 2. | \(9\) \(\Omega\) |
| 3. | \(729\) \(\Omega\) | 4. | \(243\) \(\Omega\) |
Subtopic: Derivation of Ohm's Law |
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NEET - 2023
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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. \(\frac{6.25\times10^4}{\pi}\) m/s
2. \(\frac{6.25}{\pi}\times10^3\) m/s
3. \(\frac{6.25}{\pi}\) m/s
4. \(\frac{6.25\times10^5}{\pi}\) m/s
(Given, charge on electron = \(1.6\times10^{-19}\) C)
1. \(\frac{6.25\times10^4}{\pi}\) m/s
2. \(\frac{6.25}{\pi}\times10^3\) m/s
3. \(\frac{6.25}{\pi}\) m/s
4. \(\frac{6.25\times10^5}{\pi}\) m/s
Subtopic: Current & Current Density |
72%
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: Current & Current Density |
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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: Current & Current Density |
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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: Current & Current Density |
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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: Current & Current Density |
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From NCERT
NEET - 2020
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On the basis of electrical conductivity, which one of the following material has the smallest resistivity?
| 1. | Germanium | 2. | Silver |
| 3. | Glass | 4. | Silicon |
Subtopic: Derivation of Ohm's Law |
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From NCERT
NEET - 2023
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As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity:
| 1. | increases |
| 2. | decreases |
| 3. | remains constant |
| 4. | may increase or decrease |
Subtopic: Derivation of Ohm's Law |
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Subtopic: Derivation of Ohm's Law |
79%
From NCERT
NEET - 2022
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