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  • 1(current)
Q. No.

Given below are two statements: 

Assertion (A): A uniformly moving charged particle in a uniform magnetic field, may follow a path along magnetic field lines.
Reason (R): The direction of the magnetic force experienced by a charged particle is perpendicular to its velocity and magnetic field.
 
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. Both (A) and (R) are False.
Subtopic:  Lorentz Force |
Level 3: 35%-60%
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A particle having a mass of \(10^{-2}\) kg carries a charge of \(5\times 10^{-8}~\mathrm{C}\). The particle is given an initial horizontal velocity of \(10^5~\mathrm{ms^{-1}}\) in the presence of electric field \(\vec{E}\) and magnetic field \(\vec{B}\) . To keep the particle moving in a horizontal direction, it is necessary that:
 

(a) \(\vec{B}\) should be perpendicular to the direction of velocity and \(\vec{E}\)
should be along the direction of velocity.
(b) Both \(\vec{B}\) and \(\vec{E}\) should be along the direction of velocity.
(c) Both \(\vec{B}\) and \(\vec{E}\) are mutually perpendicular and perpendicular to the direction of velocity
(d) \(\vec{B}\) should be along the direction of velocity and \(\vec{E}\) should be perpendicular to the direction of velocity.
 

Which one of the following pairs of statements is possible?

1. (c) and (d)
2. (b) and (c)
3. (b) and (d)
4. (a) and (c)
Subtopic:  Lorentz Force |
 64%
Level 2: 60%+
AIPMT - 2010
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Given below are two statements: 
Assertion (A): Work done by magnetic force on a charged particle moving in a uniform magnetic field is zero.
Reason (R): Path of a charged particle in a uniform magnetic field, projected in the direction of field, will be a straight line.
 
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. Both (A) and (R) are false.
Subtopic:  Lorentz Force |
 59%
Level 3: 35%-60%
Hints
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Given below are two statements: 
Assertion (A): If a proton and an \(\alpha\)-particle enter in a uniform magnetic field perpendicularly with the same speed, the time period of revolution of \(\alpha\)-particle is double to that of a proton.
Reason (R): In a magnetic field, the period of revolution of a charged particle is directly proportional to the charge of the particle and inversely proportional to the mass of the particle.
 
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. Both (A) and (R) are false.
Subtopic:  Lorentz Force |
 73%
Level 2: 60%+
Hints
Given below are two statements: 
Assertion (A): Magnetic field interacts with a moving charge and not with a stationary charge.
Reason (R): A moving charge produces a magnetic field, which interacts with another magnetic field.
 
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. Both (A) and (R) are false.
Subtopic:  Lorentz Force |
Level 4: Below 35%
Hints
Given below are two statements: 
Assertion (A): If a charged particle is moving on a circular path in a perpendicular magnetic field, the momentum of the particle is not changing.
Reason (R): The velocity of the particle is not changing in the magnetic field.
 
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. Both (A) and (R) are false.
Subtopic:  Lorentz Force |
 68%
Level 2: 60%+
Hints
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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%
Level 2: 60%+
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