An electron moves on a straight-line path $$XY$$ as shown. The $$\mathrm{abcd}$$ is a coil adjacent to the path of electrons. What will be the direction of current if any, induced in the coil?

 1 $$\mathrm{abcd}$$ 2 $$\mathrm{adcb}$$ 3 The current will reverse its direction as the electron goes past the coil 4 No current included

Subtopic: Â Faraday's Law & Lenz Law |
Â 74%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced emf is:
 1 twice per revolution. 2 four times per revolution. 3 six times per revolution. 4 once per revolution.

Subtopic: Â Faraday's Law & Lenz Law |
Â 74%
From NCERT
AIPMT - 2013
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A coil of resistance $$400~\Omega$$ is placed in a magnetic field. The magnetic flux $$\phi~\text{(Wb)}$$ linked with the coil varies with time $$t~\text{(s)}$$ as $$\phi=50t^{2}+4.$$ The current in the coil at $$t=2~\text{s}$$ is:
1. $$0.5~\text{A}$$
2. $$0.1~\text{A}$$
3. $$2~\text{A}$$
4. $$1~\text{A}$$

Subtopic: Â Faraday's Law & Lenz Law |
Â 87%
From NCERT
AIPMT - 2012
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The current $$i$$ in a coil varies with time as shown in the figure. The variation of induced emf with time would be:

 1 2 3 4
Subtopic: Â Faraday's Law & Lenz Law |
Â 69%
From NCERT
AIPMT - 2011
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A conducting circular loop is placed in a uniform magnetic field, $$B=0.025~\text{T}$$ with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of $$1~\text{mm s}^{-1}$$.  The induced emf, when the radius is $$2~\text{cm}$$, is:
1. $$2\pi ~\mu\text{V}$$
2. $$\pi ~\mu\text{V}$$
3. $$\frac{\pi}{2}~\mu\text{V}$$
4. $$2 ~\mu \text{V}$$

Subtopic: Â Faraday's Law & Lenz Law |
Â 75%
From NCERT
AIPMT - 2010
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A conducting circular loop is placed in a uniform magnetic field of 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at a rate of 2 mm/s. The induced e.m.f. in the loop when the radius is 2 cm is:

1. $$3.2\pi ~\mu V$$

2. $$4.8\pi ~\mu V$$

3. $$0.8\pi ~\mu V$$

4. $$1.6\pi ~\mu V$$

Subtopic: Â Faraday's Law & Lenz Law |
Â 69%
From NCERT
AIPMT - 2009
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints