- 1(current)
Q. No.A current carrying circular loop of wire is placed in a magnetic field \(B\), which makes an angle \(\theta\) with the normal to the loop. The radius of the loop is \(r\), and the loop carries a current \(i\). The magnetic interaction energy of the current carrying loop is \(E_B\) and the torque on the loop has the magnitude \(\tau_B\).
Which of the following, is independent of \(\theta?\)
Which of the following, is independent of \(\theta?\)
| 1. | \(E_B\cdot\tau_B\) | 2. | \(\dfrac{E_B}{\tau_B}\) |
| 3. | \(E_B^2+\tau_B^2\) | 4. | \(E_B^2-\tau_B^2\) |
Subtopic: Â Analogy between Electrostatics & Magnetostatics |
 61%
Level 2: 60%+
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A bar magnet with a magnetic moment of \(5~\text{Am}^2\) is initially in a stable equilibrium within a uniform external magnetic field of \(0.4~\text T.\) The work required to slowly rotate the bar magnet into a position of unstable equilibrium is:
1. \(1~\text J\)
2. \(2~\text J\)
3. \(3~\text J\)
4. \(4~\text J\)
1. \(1~\text J\)
2. \(2~\text J\)
3. \(3~\text J\)
4. \(4~\text J\)
Subtopic: Â Analogy between Electrostatics & Magnetostatics |
 65%
Level 2: 60%+
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The magnetic potential energy when a magnetic bar with a magnetic moment \(\vec{M}\) is placed perpendicular to the magnetic field \(\vec{B}\) is:
| 1. | \(\dfrac{-mB}{2}\) | 2. | zero |
| 3. | \(-mB\) | 4. | \(mB\) |
Subtopic: Â Analogy between Electrostatics & Magnetostatics |
 75%
Level 2: 60%+
NEET - 2024
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Magnetic induction at an axial point of a short magnet at a distance \(r\) from the centre of dipole is \(\vec B\). Its value at the equatorial point of the short magnet at the same distance from the centre of dipole is:
| 1. | \(-\vec B\) | 2. | \(\dfrac{\vec B}{2}\) |
| 3. | \(\vec B\) | 4. | \(\dfrac{-\vec B}{2}\) |
Subtopic: Â Analogy between Electrostatics & Magnetostatics |
 69%
Level 2: 60%+
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The ratio of the magnitudes of the equatorial and axial fields due to a bar magnet of length \(5.0~\text{cm}\) at a distance of \(50~\text{cm}\) from its mid-point is:
(given, the magnetic moment of the bar magnet is \(0.40~\text{Am}^{2}\))
1. \(\dfrac{1}{2}\)
2. \(2\)
3. \(1\)
4. \(\dfrac{3}{2}\)
Subtopic: Â Analogy between Electrostatics & Magnetostatics |
 75%
Level 2: 60%+
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A short bar magnet has a magnetic moment of \(0.48~\text{JT}^{-1}.\) The direction and magnitude of the magnetic field produced by the magnet at a distance of \(10~\text{cm}\) from the centre of the magnet on the equatorial lines (normal bisector) of the magnet are:
| 1. | \(0.38~\text{G}\) along the \(\text{N-S}\) direction. |
| 2. | \(0.48~\text{G}\) along the \(\text{N-S}\) direction. |
| 3. | \(0.38~\text{G}\) along the \(\text{S-N}\) direction. |
| 4. | \(0.48~\text{G}\) along the \(\text{S-N}\) direction. |
Subtopic: Â Analogy between Electrostatics & Magnetostatics |
 70%
Level 2: 60%+
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Given below are two statements:
| Assertion (A): | Gauss's law for magnetism states that the net magnetic flux through any closed surface is zero. |
| Reason (R): | The magnetic monopoles do not exist. North and South poles occur in pairs, allowing vanishing net magnetic flux through the surface. |
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Subtopic: Â Analogy between Electrostatics & Magnetostatics |
 77%
Level 2: 60%+
NEET - 2022
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Subtopic: Â Analogy between Electrostatics & Magnetostatics |
 87%
Level 1: 80%+
NEET - 2023
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Essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding is due to
Choose the correct option:
1. (a), (c)
2. (a), (c), (d)
3. (b), (d)
4. (c), (d)
| (a) | electrostatic field lines can end on charges and conductors have free charges. |
| (b) | lines of \(B\) can also end but conductors cannot end them. |
| (c) | lines of \(B\) cannot end on any material and perfect shielding is not possible. |
| (d) | shells of high permeability materials can be used to divert lines of \(B\) from the interior region. |
Choose the correct option:
1. (a), (c)
2. (a), (c), (d)
3. (b), (d)
4. (c), (d)
Subtopic: Â Analogy between Electrostatics & Magnetostatics |
 57%
Level 3: 35%-60%
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