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 |
From NCERT
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Given below are two statements: 

Assertion (A): 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 (R): 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. Both (A) and (R) are false.
Subtopic:  Force between Current Carrying Wires |
 76%
From NCERT
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Given below are two statements: 

Assertion (A): No electric current will be present within a region having a uniform and constant magnetic field.
Reason (R): Within a region of uniform and constant magnetic field B the path integral of the magnetic field φB.dl along any closed path is zero. Hence from ampere circuital law \(\varphi \overrightarrow{\mathrm{B}} \cdot \overrightarrow{\mathrm{dl}}=\mu_0 1\) (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. Both (A) and (R) are false.
Subtopic:  Ampere Circuital Law |
 61%
From NCERT
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Given below are two statements: 

Assertion (A): 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 (R): 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. Both (A) and (R) are false.
Subtopic:  Current Carrying Loop: Force & Torque |
From NCERT
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Given below are two statements: 

Assertion (A):

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 λ. Keeping A fixed, when B is raised by a small height dh, the net work done by external force per unit length will be λgdh.

Reason (R): 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. Both (A) and (R) are false.

Subtopic:  Force between Current Carrying Wires |
From NCERT
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A cylindrical conductor of radius \(R\) is carrying a constant current. The plot of the magnitude of the magnetic field \(B\) with the distance \(d\) from the centre of the conductor is correctly represented by the figure:

1. 2.
3. 4.
Subtopic:  Ampere Circuital Law |
 69%
From NCERT
NEET - 2019
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What is a representation of the magnetic field caused by a straight conductor with a uniform cross-section and a steady current of radius 'a'?

1. 2.
3. 4.
Subtopic:  Ampere Circuital Law |
 73%
From NCERT
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The magnetic field due to a straight conductor of a uniform cross-section of radius \(a\) and carrying a steady current is represented by:

1. 2.  
3. 4.
Subtopic:  Biot-Savart Law |
 74%
From NCERT
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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 |
 61%
From NCERT
AIPMT - 2010
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Given below are two statements: 

Statement I: The magnetic field due to a segment \(\overrightarrow{dl}\) of a current-carrying wire carrying a current, \(I\) is given by:
  \(\overrightarrow{dB}=\frac{\mu_0}{4\pi}~I\left(\overrightarrow{dl}\times\frac{\overrightarrow r}{r^3}\right )\),
where \(\vec{r}\) is the position vector of the field point with respect to the wire segment.
Statement II: The magnetic field of a current-carrying wire is never parallel to the wire.
 
1. Statement I and Statement II are true and Statement I is the correct explanation of Statement II.
2. Statement I and Statement II are true and Statement I is not the correct explanation of Statement II.
3. Statement I is true, Statement II is false.
4. Statement I is false, Statement II is true.
Subtopic:  Biot-Savart Law |
From NCERT
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