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:

 1 2 3 4
Subtopic:  Derivation of Ohm's Law |
79%
From NCERT
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 |
73%
From NCERT
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. $$\dfrac{6.25\times10^4}{\pi}$$ 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:  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:  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:  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
Subtopic:  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:  Current & Current Density |
82%
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 |
62%
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 |
76%
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The reciprocal of resistance is:
 1 reactance 2 mobility 3 conductivity 4 conductance
Subtopic:  Derivation of Ohm's Law |
79%
From NCERT
NEET - 2022
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