A conducting square frame of side $$a$$ and a long straight wire carrying current $$I$$ are located in the same plane as shown in the figure. The frame moves to the right with a constant velocity $$v.$$ The emf induced in the frame will be proportional to:

1. $$\frac{1}{x^2}$$
2. $$\frac{1}{(2 x-a)^2}$$
3. $$\frac{1}{(2 x+a)^2}$$
4. $$\frac{1}{(2 x-a)(2 x+a)}$$

Subtopic:  Motional emf |
72%
From NCERT
NEET - 2015
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

A thin semicircular conducting the ring $$(PQR)$$ of radius $$r$$ is falling with its plane vertical in a horizontal magnetic field $$B,$$ as shown in the figure. The potential difference developed across the ring when it moves with speed $$v$$ is:

 1 zero 2 $$Bv\pi r^{2}/2$$ and $$P$$ is at a higher potential 3 $$\pi rvB$$ and $$R$$ is at a higher potential 4 $$2BvR$$ and $$R$$ is at higher potential
Subtopic:  Motional emf |
74%
From NCERT
AIPMT - 2014
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NEET 2023 - Target Batch - Aryan Raj Singh

A rectangular, a square, a circular, and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocity, $\stackrel{\to }{\mathrm{v}}=\mathrm{v}\stackrel{^}{\mathrm{i}}$. The magnetic field is directed along the negative z-axis direction. The induced emf, during the passage of these loops out of the field region, will not remain constant for:

 1 the rectangular, circular, and elliptical loops. 2 the circular and the elliptical loops. 3 only the elliptical loop. 4 any of the four loops.

Subtopic:  Motional emf |
71%
From NCERT
AIPMT - 2009
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NEET 2023 - Target Batch - Aryan Raj Singh
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