- 1(current)
Q. No.A rectangular wire loop of sides \(8\) cm and \(3\) cm with a small cut is moving out of a region of uniform magnetic field of magnitude \(0.3\) T directed normal to the plane of the loop. The emf developed across the cut, if the velocity of the loop is \(2\) cm-s-1, in a direction normal to the shorter side of the loop, will be:
1. \(1.8\times 10^{-4}\) volts
2. \(1.2\times 10^{-4}\) volts
3. \(1.3\times 10^{-4}\) volts
4. \(4.8\times 10^{-4}\) volts
1. \(1.8\times 10^{-4}\) volts
2. \(1.2\times 10^{-4}\) volts
3. \(1.3\times 10^{-4}\) volts
4. \(4.8\times 10^{-4}\) volts
Subtopic: Â Motional emf |
 54%
Level 3: 35%-60%
NEET - 2026
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Please attempt this question first.
A rod of length \(L\) rotates with a small uniform angular velocity \(\omega\) about its perpendicular bisector. A uniform magnetic field \(B\) exists parallel to the axis of rotation. The potential difference between the centre of the rod and an end is:
| 1. | \(\Large\frac{B\omega L^2}{8}\) | 2. | \(\Large\frac{B\omega L^2}{2}\) |
| 3. | \(\Large\frac{B\omega L^2}{4}\) | 4. | zero |
Subtopic: Â Motional emf |
Level 3: 35%-60%
NEET - 2024
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An emf is generated by an ac generator having \(100\) turn coil, of loop area \(1\) m2. The coil rotates at a speed of one revolution per second and placed in a uniform magnetic field of \(0.05\) T perpendicular to the axis of rotation of the coil. The maximum value of emf is:
1. \(3.14\) V
2. \(31.4\) V
3. \(62.8\) V
4. \(6.28\) V
1. \(3.14\) V
2. \(31.4\) V
3. \(62.8\) V
4. \(6.28\) V
Subtopic: Â Motional emf |
 76%
Level 2: 60%+
NEET - 2023
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A wheel with \(20\) metallic spokes, each \(1\) m long, is rotated with a speed of \(120\) rpm in a plane perpendicular to a magnetic field of \(0.4~\text{G}\). The induced emf between the axle and rim of the wheel will be:
\((1~\text{G}=10^{-4}~\text{T})\)
1. \(2.51 \times10^{-4}\) V
2. \(2.51 \times10^{-5}\) V
3. \(4.0 \times10^{-5}\) V
4. \(2.51\) V
Subtopic: Â Motional emf |
 62%
Level 2: 60%+
NEET - 2020
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A cycle wheel of radius \(0.5\) m is rotated with a constant angular velocity of \(10\) rad/s in a region of a magnetic field of \(0.1\) T which is perpendicular to the plane of the wheel. The EMF generated between its centre and the rim is:
| 1. | \(0.25\) V | 2. | \(0.125\) V |
| 3. | \(0.5\) V | 4. | zero |
Subtopic: Â Motional emf |
 70%
Level 2: 60%+
NEET - 2019
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- 1(current)
Q. No.
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