The magnetic flux linked with a coil varies with time as $\varphi$ $=$ $2{t}^{2}-6t+5$, where $\varphi$ is in weber and t is in seconds. The induced current is zero at:

1. t = 0

2. t = 1.5 s

3. t = 3 s

4. t = 5 s

Subtopic:  Faraday's Law & Lenz Law |
90%
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A coil having number of turns N and cross-sectional area A is rotated in a uniform magnetic field B with an angular velocity $\mathrm{\omega }$. The maximum value of the emf induced in it is:

1. $\frac{\mathrm{NBA}}{\mathrm{\omega }}$

2. $\mathrm{NBA\omega }$

3. $\frac{\mathrm{NBA}}{{\mathrm{\omega }}^{2}}$

4. ${\mathrm{NBA\omega }}^{2}$

Subtopic:  Faraday's Law & Lenz Law |
88%
From NCERT
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The current in a coil varies with time t as $\mathrm{I}$ $=$ $3{\mathrm{t}}^{2}+$ $2\mathrm{t}$. If the inductance of coil be 10 mH, the value of induced e.m.f. at $$t=2~\mathrm{s}$$ will be:
1. $$0.14~\mathrm{V}$$
2. $$0.12~\mathrm{V}$$
3. $$0.11~\mathrm{V}$$
4. $$0.13~\mathrm{V}$$

Subtopic:  Faraday's Law & Lenz Law |
88%
From NCERT
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In a circuit with a coil of resistance 2 ohms, the magnetic flux changes from 2.0 Wb to 10.0 Wb in 0.2 second. The charge that flows in the coil during this time is:
1. 5.0 coulomb
2. 4.0 coulomb
3. 1.0 coulomb
4. 0.8 coulomb

Subtopic:  Faraday's Law & Lenz Law |
88%
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A bar magnet is released along the vertical axis of the conducting coil. The acceleration of the bar magnet is:

 1 greater than g. 2 less than g. 3 equal to g. 4 zero.
Subtopic:  Faraday's Law & Lenz Law |
85%
From NCERT
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A coil having an area ${A}_{0}$ is placed in a magnetic field which changes from ${B}_{0}$ $to$ $4{B}_{0}$ in time interval t. The average EMF induced in the coil will be:

1. $\frac{3{A}_{0}{B}_{0}}{t}$

2. $\frac{4{A}_{0}{B}_{0}}{t}$

3. $\frac{3{B}_{0}}{{A}_{0}t}$

4. $\frac{4{B}_{0}}{{A}_{0}t}$

Subtopic:  Faraday's Law & Lenz Law |
87%
From NCERT
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A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is:

 1 Twice per revolution 2 Four times per revolution 3 Six times per revolution 4 Once per revolution
Subtopic:  Faraday's Law & Lenz Law |
73%
From NCERT
AIPMT - 2013
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An aluminium ring B faces an electromagnet A. If the current I through A can be altered, then:

 1 whether I increases or decreases, B will not experience any force. 2 if I decreases, A will repel B. 3 if I increases, A will attract B. 4 if I increases, A will repel B.
Subtopic:  Faraday's Law & Lenz Law |
70%
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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:  Faraday's Law & Lenz Law |
69%
From NCERT
AIPMT - 2009
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A magnet is brought towards a coil first (i) speedily (ii) slowly. It can be concluded that the induced e.m.f. and the induced charge in the two cases, will be respectively:

 1 More in the first case, more in the first case. 2 More in the first case, equal in both cases. 3 Less in the first case, more in the second case. 4 Less in the first case, equal in both cases.

Subtopic:  Faraday's Law & Lenz Law |
68%
From NCERT
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