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Q. No.A charged particle is moving in a uniform magnetic field \((2 \hat{i}+3 \hat{j}) ~\text{T} .\) If it has an acceleration of \((\alpha \hat{i}-4 \hat{j})~ \text{m /s}^{2},\) then the value of \(\alpha \) will be:
1. \(3\)
2. \(6\)
3. \(12\)
4. \(2\)
Subtopic: Lorentz Force |
87%
From NCERT
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Given below are two statements:
| Assertion (A): | In a uniform magnetic field, speed and energy remain the same for a moving charged particle. |
| Reason (R): | Moving charged particle experiences a magnetic force perpendicular to its direction of motion. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Lorentz Force |
68%
From NCERT
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A long solenoid carrying a current produces a magnetic field \(B\) along its axis. If the current is doubled and the number of turns per cm is halved, then the new value of the magnetic field will be equal to:
1. \(B\)
2. \(2B\)
3. \(4B\)
4. \(\dfrac B 2\)
1. \(B\)
2. \(2B\)
3. \(4B\)
4. \(\dfrac B 2\)
Subtopic: Ampere Circuital Law |
91%
From NCERT
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The magnetic field near a current-carrying conductor is given by:
| 1. | Coulomb's law | 2. | Lenz's law |
| 3. | Biot-Savart law | 4. | Kirchoff's law |
Subtopic: Biot-Savart Law |
94%
From NCERT
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The shape of the magnetic field lines due to an infinite long, straight current carrying conductor is:
1. a straight line
2. circular
3. elliptical
4. a plane
1. a straight line
2. circular
3. elliptical
4. a plane
Subtopic: Magnetic Field due to various cases |
72%
From NCERT
NEET - 2022
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Two very long, straight, parallel conductor \(\mathrm{A}\) and \(\mathrm{B}\) carry current of \(5~\text{A}\) and \(10~\text{A}\) respectively and are at a distance of \(10~\mathrm{cm}\) from each other. The direction of the current in the two conductors is the same. The force acting per unit length between two conductors is:
(\(\mu_0=4\pi \times 10^{-7}\) SI unit)
(\(\mu_0=4\pi \times 10^{-7}\) SI unit)
| 1. | \(2\times10^{-4}~\text{Nm}^{-1}\) and is attractive |
| 2. | \(2\times10^{-4}~\text{Nm}^{-1}\) and is repulsive |
| 3. | \(1\times10^{-4}~\text{Nm}^{-1}\) and is attractive |
| 4. | \(1\times10^{-4}~\text{Nm}^{-1}\) and is repulsive |
Subtopic: Force between Current Carrying Wires |
75%
From NCERT
NEET - 2022
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Two parallel, long wires are kept \(0.20~\text m\) apart in a vacuum, each carrying current of \(x ~\text A\) in the same direction. If the force of attraction per meter of each wire is \(2 \times 10^{-6} ~\text N,\) then the value of \(x \) is approximately:
1. \(1\)
2. \(2.4\)
3. \(1.4\)
4. \(2\)
1. \(1\)
2. \(2.4\)
3. \(1.4\)
4. \(2\)
Subtopic: Force between Current Carrying Wires |
75%
From NCERT
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A magnetized wire of magnetic moment \(M\) and length \(L\) is bent in the form of the semi-circle of radius \(r\). The new magnetic moment is:
1. \(M\)
2. \(M / 2 \pi\)
3. \(M / \pi\)
4. \(2M / \pi\)
1. \(M\)
2. \(M / 2 \pi\)
3. \(M / \pi\)
4. \(2M / \pi\)
Subtopic: Magnetic Moment |
53%
From NCERT
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The value of unknown resistance \(R\) for which \(20\)% of the main current passes through a galvanometer of resistance \(80\) \(\Omega \) is:
| 1. | \(10\) \(\Omega \) | 2. | \(20\) \(\Omega \) |
| 3. | \(30\) \(\Omega \) | 4. | \(40\) \(\Omega \) |
Subtopic: Conversion to Ammeter & Voltmeter |
86%
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Given below are two statements:
| Statement I: | A charged particle moving in a magnetic field experiences a force which is zero only when it moves in the direction of the field or against it. |
| Statement II: | Whenever a charged particle moves in a uniform magnetic field, its trajectory may be a circle, a straight line or a helix. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Lorentz Force |
73%
From NCERT
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