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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)
(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 |
 74%
Level 2: 60%+
NEET - 2023
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Match Column-I and Column-II with appropriate relations.
| Column-I | Column-II | ||
| \(\mathrm{(A)}\) | Drift Velocity | \(\mathrm{(P)}\) | \(\dfrac{{m}}{{ne}^2 \rho}\) |
| \(\mathrm{(B)}\) | Electrical Resistivity | \(\mathrm{(Q)}\) | \(nev_d\) |
| \(\mathrm{(C)}\) | Relaxation Period | \(\mathrm{(R)}\) | \(\dfrac{ {eE}}{{m}} \tau\) |
| \(\mathrm{(D)}\) | Current Density | \(\mathrm{(S)}\) | \(\dfrac{E}{J}\) |
| \(\mathrm{(A)}\) | \(\mathrm{(B)}\) | \(\mathrm{(C)}\) | \(\mathrm{(D)}\) | |
| 1. | \(\mathrm{(R)}\) | \(\mathrm{(P)}\) | \(\mathrm{(S)}\) | \(\mathrm{(Q)}\) |
| 2. | \(\mathrm{(R)}\) | \(\mathrm{(Q)}\) | \(\mathrm{(S)}\) | \(\mathrm{(P)}\) |
| 3. | \(\mathrm{(R)}\) | \(\mathrm{(S)}\) | \(\mathrm{(P)}\) | \(\mathrm{(Q)}\) |
| 4. | \(\mathrm{(R)}\) | \(\mathrm{(S)}\) | \(\mathrm{(Q)}\) | \(\mathrm{(P)}\) |
Subtopic: Â Current & Current Density |
 58%
Level 3: 35%-60%
NEET - 2021
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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 |
 83%
Level 1: 80%+
NEET - 2020
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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 |
 62%
Level 2: 60%+
NEET - 2015
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Arrange the following in the order of their resistance.
Choose the correct answer from the options given below:
| A. | (\(0\) to \(1~\text A\)) ranged ammeter. |
| B. | (\(0\) to \(100~\text {mA}\)) ranged milli-ammeter. |
| C. | (\(0\) to \(500~\mu\text A\)) ranged micro-ammeter. |
| D. | (\(0\) to \(100~\text V\)) ranged voltmeter. |
Choose the correct answer from the options given below:
| 1. | \(\mathrm{A > B > C > D}\) | 2. | \(\mathrm{D > C > B > A}\) |
| 3. | \(\mathrm{D > A > B > C}\) | 4. | \(\mathrm{C > B > A > D}\) |
Subtopic: Â Derivation of Ohm's Law |
 54%
Level 3: 35%-60%
NEET - 2024
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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: Â Derivation of Ohm's Law |
 75%
Level 2: 60%+
NEET - 2023
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The resistance of platinum wire at \(0^{\circ} \text{C}\) is \(2~ \Omega\) and \(6.8~ \Omega\) at \(80^{\circ}\text{C}\). The temperature coefficient of resistance of the wire is:
1. \(3\times 10^{-1}~^\circ \text{C}^{-1}\)
2. \(3 \times 10^{-4}~^\circ \text{C}^{-1}\)
3. \(3 \times 10^{-3}~^\circ \text{C}^{-1}\)
4. \(3 \times 10^{-2}~^\circ \text{C}^{-1}\)
1. \(3\times 10^{-1}~^\circ \text{C}^{-1}\)
2. \(3 \times 10^{-4}~^\circ \text{C}^{-1}\)
3. \(3 \times 10^{-3}~^\circ \text{C}^{-1}\)
4. \(3 \times 10^{-2}~^\circ \text{C}^{-1}\)
Subtopic: Â Derivation of Ohm's Law |
 73%
Level 2: 60%+
NEET - 2023
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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: Â Derivation of Ohm's Law |
 81%
Level 1: 80%+
NEET - 2022
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Two rods of equal length \(1~\text{m}\) and equal cross-sectional area \(0.01~\text{cm}^2\) are joined in series, as shown. One rod is copper with resistivity \(1.7\times10^{-6}~\Omega\text{-cm},\) and the other is iron with resistivity \(10^{-5}~\Omega\text-\text{cm}.\) What voltage must be applied across the combination to maintain a current of \(1~\text A\) in the circuit?
| 1. | \(0.00145~\text V\) | 2. | \(0.0145~\text V\) |
| 3. | \(1.7\times10^{-6}~\text V\) | 4. | \(0.117~\text V\) |
Subtopic: Â Derivation of Ohm's Law |
 64%
Level 2: 60%+
NEET - 2013
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\(10\) resistors, each of resistance \(R\) are connected in series to a battery of \(E\) and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased \(n\) times. The value of \(n\) is:
| 1. | \(1000\) | 2. | \(10\) |
| 3. | \(100\) | 4. | \(1\) |
Subtopic: Â Combination of Resistors |
 69%
Level 2: 60%+
NEET - 2023
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