- 1(current)
Q. No.A model for the quantized motion of an electron in a uniform magnetic field \(B\) states that the flux passing through the orbit of the electron is \(n(h/e)\) where \(n\) is an integer, \(h\) is Planck's constant and \(e\) is the magnitude of the electron's charge. According to the model, the magnetic moment of an electron is its lowest energy state will be (\(m\) is the mass of the electron):
| 1. | \(\dfrac{heB}{\pi m}\) | 2. | \(\dfrac{heB}{2\pi m}\) |
| 3. | \(\dfrac{he}{\pi m}\) | 4. | \(\dfrac{he}{2\pi m}\) |
Subtopic: Â Magnetic Moment |
Level 3: 35%-60%
NEET - 2025
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A \(2~\text{amp}\) current is flowing through two different small circular copper coils having radii ratio \(1:2.\) The ratio of their respective magnetic moments will be:
1. \(2: 1\)
2. \(4: 1\)
3. \(1: 4\)
4. \(1: 2\)
1. \(2: 1\)
2. \(4: 1\)
3. \(1: 4\)
4. \(1: 2\)
Subtopic: Â Magnetic Moment |
 63%
Level 2: 60%+
NEET - 2025
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The ratio of the radii of two circular coils is \(1:2.\) The ratio of currents in the respective coils such that the same magnetic moment is produced at the centre of each coil is:
| 1. | \(4:1\) | 2. | \(2:1\) |
| 3. | \(1:2\) | 4. | \(1:4\) |
Subtopic: Â Magnetic Moment |
 64%
Level 2: 60%+
NEET - 2022
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A uniform conducting wire of length \(12a\) and resistance '\(R\)' is wound up as a current-carrying coil in the shape of;
| (i) | an equilateral triangle of side '\(a\)' |
| (ii) | a square of side '\(a\)' |
The magnetic dipole moments of the coil in each case respectively are:
1. \(3Ia^2~\text{and}~4Ia^2\)
2. \(4Ia^2~\text{and}~3Ia^2\)
3. \(\sqrt{3}Ia^2~\text{and}~3Ia^2\)
4. \(3Ia^2~\text{and}~Ia^2\)
Subtopic: Â Magnetic Moment |
 63%
Level 2: 60%+
NEET - 2021
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A wire of length \(L\) meters carrying a current of \(I\) ampere is bent in the form of a circle. What is its magnetic moment?
| 1. | \( \dfrac{{IL}^2}{4} ~\text{A}\text-\text{m}^2 \) | 2. | \( \dfrac{{I} \times \pi {L}^2}{4} ~\text{A}\text-\text{m}^2 \) |
| 3. | \( \dfrac{2 {IL}^2}{\pi}~\text{A}\text-\text{m}^2 \) | 4. | \( \dfrac{{IL}^2}{4 \pi}~\text{A}\text-\text{m}^2 \) |
Subtopic: Â Magnetic Moment |
 76%
Level 2: 60%+
NEET - 2020
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If a charged particle (charge \(q\)) is moving in a circle of radius \(R\) at a uniform speed \(v\), then the value of its associated magnetic moment \(\mu\) will be:
1. \(\frac{qvR}{2}\)
2. \(qvR^{2}\)
3. \(\frac{qvR^{2}}{2}\)
4. \(qvR\)
1. \(\frac{qvR}{2}\)
2. \(qvR^{2}\)
3. \(\frac{qvR^{2}}{2}\)
4. \(qvR\)
Subtopic: Â Magnetic Moment |
 76%
Level 2: 60%+
AIPMT - 2007
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If the number of turns, area, and current through a coil are given by \(n\), \(A\) and \(i\) respectively then its magnetic moment will be:
1. \(niA\)
2. \(n^{2}iA\)
3. \(niA^{2}\)
4. \(\frac{ni}{\sqrt{A}}\)
Subtopic: Â Magnetic Moment |
 92%
Level 1: 80%+
AIPMT - 2001
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Q. No.
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