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Q. No.The plot of current I (A)I (A) flowing through a metallic conductor versus the applied voltage V (volt)V (volt) across the ends of a conductor is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Derivation of Ohm's Law |
80%
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NEET - 2022
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A certain wire AA has resistance 81 Ω.81 Ω. The resistance of another wire BB of the same material and equal length but of diameter thrice the diameter of AA will be:
| 1. | 81 Ω81 Ω | 2. | 9 Ω9 Ω |
| 3. | 729 Ω729 Ω | 4. | 243 Ω243 Ω |
Subtopic: Derivation of Ohm's Law |
75%
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NEET - 2023
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A copper wire of radius 11 mm contains 10221022 free electrons per cubic metre. The drift velocity for free electrons when 1010 A current flows through the wire will be:
(Given, charge on electron = 1.6×10−191.6×10−19 C)
(Given, charge on electron = 1.6×10−191.6×10−19 C)
| 1. | 6.25×104π6.25×104π m/s | 2. | 6.25π×1036.25π×103 m/s |
| 3. | 6.25π6.25π m/s | 4. | 6.25×105π6.25×105π m/s |
Subtopic: Current & Current Density |
73%
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 |
56%
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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 |
61%
From NCERT
NEET - 2015
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A copper wire of length 1010 m and radius (10−2/√π)(10−2/√π) m has an electrical resistance of 10 Ω.10 Ω. The current density in the wire for an electric field strength of 1010 (V/m) is:
1. 105105 A/m2
2. 104104 A/m2
3. 106106 A/m2
4. 10−510−5 A/m2
1. 105105 A/m2
2. 104104 A/m2
3. 106106 A/m2
4. 10−510−5 A/m2
Subtopic: Current & Current Density |
68%
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NEET - 2022
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A charged particle having drift velocity of 7.5×10−4 ms−17.5×10−4 ms−1 in an electric field of 3×10−10 Vm−1,3×10−10 Vm−1, has mobility of:
1. 2.5×106 m2V−1s−12.5×106 m2V−1s−1
2. 2.5×10−6 m2V−1s−12.5×10−6 m2V−1s−1
3. 2.25×10−15 m2V−1s−12.25×10−15 m2V−1s−1
4. 2.25×1015 m2V−1s−12.25×1015 m2V−1s−1
Subtopic: Current & Current Density |
83%
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
1. Germanium
2. Silver
3. Glass
4. Silicon
Subtopic: Derivation of Ohm's Law |
65%
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 |
77%
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Subtopic: Derivation of Ohm's Law |
81%
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NEET - 2022
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