A metallic rod of 1 m length is rotated with a frequency of 50 rev/s, with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius 1 m, about an axis passing through the centre and perpendicular to the plane of the ring (as shown in the figure). A constant and uniform magnetic field of 1 T parallel to the axis is present everywhere. What is the emf between the centre and the metallic ring?

1. 150 V

2. 130 V

3. 157 V

4. 133V

Subtopic:  Motional emf |
71%
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NEET 2023 - Target Batch - Aryan Raj Singh
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A wheel with $$10$$ metallic spokes each $$0.5$$ m long is rotated with a speed of $$120$$ rev/min in a plane normal to the horizontal component of earth’s magnetic field HE at a place. If $$H_E=0.4$$ G at the place, what is the induced emf between the axle and the rim of the wheel? ($$1$$ G=$$10^{-4}$$ T)
1. $$5.12\times10^{-5}$$ T
2. $$0$$
3. $$3.33\times10^{-5}$$
4. $$6.28\times10^{-5}$$

Subtopic:  Motional emf |
64%
From NCERT
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Refer to figure. The arm PQ of the rectangular conductor is moved from x = 0, outwards. The uniform magnetic field is perpendicular to the plane and extends from x = 0 to x = b and is zero for x > b. Only the arm PQ possesses substantial resistance r. Consider the situation when the arm PQ is pulled outwards from = 0 to x = 2b with a constant speed v. The induced emf is:

Subtopic:  Motional emf |
50%
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Refer to the figure. The arm PQ of the rectangular conductor is moved from x = 0, outwards. The uniform magnetic field is perpendicular to the plane and extends from x = 0 to x = b and is zero for x > b. Only the arm PQ possesses substantial resistance r. Consider the situation when the arm PQ is pulled outwards from = 0 to x = 2b with constant speed v. The force necessary to pull the arm is:

Subtopic:  Motional emf |
74%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Refer to figure. The arm PQ of the rectangular conductor is moved from x = 0, outwards. The uniform magnetic field is perpendicular to the plane and extends from x = 0 to x = b and is zero for x > b. Only the arm PQ possesses substantial resistance r. Consider the situation when the arm PQ is pulled outwards from = 0 to x = 2b and is then moved back to x = 0 with constant speed v. The power dissipated as Joule heat is:

Subtopic:  Motional emf |
73%
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NEET 2023 - Target Batch - Aryan Raj Singh
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Kamla peddles a stationary bicycle. The pedals of the bicycle are attached to a $$100$$ turn coil of an area of $$0.10~\text{m}^2$$. The coil rotates at half a revolution per second and it is placed in a uniform magnetic field of $$0.01~\text{T}$$ perpendicular to the axis of rotation of the coil. What is the maximum voltage generated in the coil?
1. $$0.628~\text{V}$$

2. $$0.421~\text{V}$$

3. $$0.314~\text{V}$$

4. $$0$$

Subtopic:  Motional emf |
55%
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NEET 2023 - Target Batch - Aryan Raj Singh
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