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The plot of current I (A) flowing through a metallic conductor versus the applied voltage V (volt) across the ends of a conductor is:

1.   2.
3. 4.
Subtopic:  Derivation of Ohm's Law |
 80%
From NCERT
NEET - 2022
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A certain wire A has resistance 81 Ω. 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 Ω 2. 9 Ω
3. 729 Ω 4. 243 Ω
Subtopic:  Derivation of Ohm's Law |
 74%
From NCERT
NEET - 2023
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A copper wire of radius 1 mm contains 1022 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 = 1.6×1019 C)
1. 6.25×104π m/s
2. 6.25π×103 m/s
3. 6.25π m/s
4. 6.25×105π 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 |
 57%
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 |
 61%
From NCERT
NEET - 2015
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A copper wire of length 10 m and radius (102/π) m has an electrical resistance of 10 Ω. The current density in the wire for an electric field strength of 10 (V/m) is: 
1. 105 A/m2
2. 104 A/m2
3. 106 A/m2
4. 105 A/m2
Subtopic:  Current & Current Density |
 68%
From NCERT
NEET - 2022
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A charged particle having drift velocity of 7.5×104 ms1 in an electric field of 3×1010 Vm1, has mobility of: 
1. 2.5×106 m2V1s1
2. 2.5×106 m2V1s1
3. 2.25×1015 m2V1s1
4. 2.25×1015 m2V1s1

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 
Subtopic:  Derivation of Ohm's Law |
 64%
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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The reciprocal of resistance is:
1. reactance 2. mobility
3. conductivity 4. conductance
Subtopic:  Derivation of Ohm's Law |
 80%
From NCERT
NEET - 2022
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