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. A is false and R is also false.
Subtopic:  Lorentz Force |
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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. (A) is false and (R) is also false.
Subtopic:  Lorentz Force |
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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. (A) is false and (R) is also false.
Subtopic:  Lorentz Force |
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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. (A) is false and (R) is also false.
Subtopic:  Lorentz Force |
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Given below are two statements:

 I: Biot-Savart's law gives us the expression for the magnetic field strength of an infinitesimal current element (Idl) of a current-carrying conductor only. II: Biot-Savart's law is analogous to Coulomb's inverse square law of charge q, with the former being related to the field produced by a scalar source, Idl while the latter being produced by a vector source, q.

In light of above statements choose the most appropriate answer from the options given below:

 1 I is incorrect and II is correct. 2 Both I and II are correct. 3 Both I and II are incorrect. 4 I is correct and II is incorrect.
Subtopic:  Biot-Savart Law |
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Assertion: Two straight current-carrying conductors A and B are lying in a vertical plane as shown. The separation between them is h and mass per unit length is $\lambda$. Keeping A fixed, when B is raised by a small height dh, the net work done by external force per unit length will be $\lambda$gdh. Reason: The work done by magnetic field during this process is non-zero.
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 and (R) is also false.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false
Subtopic:  Force between Current Carrying Wires |
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Assertion: In the arrangement shown, the hoop carries a constant current. This hoop can remain stationary under the effect of the magnetic field of the bar magnet. Reason: When a magnetic dipole is placed in a non-uniform magnetic field, it experiences a force opposite to the external magnetic field at its center.
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 and (R) is also false.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false
Subtopic:  Current Carrying Loop: Force & Torque |
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Assertion: A uniformly moving charged particle in a uniform magnetic field, may follow a path along magnetic field lines.

Reason: 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. (A) is false and (R) is also false.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false
Subtopic:  Lorentz Force |
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Assertion: Two parallel wires carrying current in the same direction attract each other, whereas two proton beams moving parallel to each other repel each other.

Reason: Wire-carrying current is electrically neutral, therefore it is experiencing only magnetic attraction while the electric force of repulsion between protons is more than magnetic attraction.
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 and (R) is also false.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false
Subtopic:  Force between Current Carrying Wires |
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Assertion: No electric current will be present within a region having a uniform and constant magnetic field.

Reason: Within a region of uniform and constant magnetic field $\stackrel{\to }{\mathrm{B}}$ the path integral of the magnetic field $\mathrm{\phi }\stackrel{\to }{\mathrm{B}}.\stackrel{\to }{\mathrm{dl}}$ along any closed path is zero. Hence from ampere circuital law  (where the given terms have usual meaning), no current can be present within a region having a uniform and constant 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. (A) is false and (R) is also false.
1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false
Subtopic:  Ampere Circuital Law |
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