Select Chapter Topics: A circular disc of radius 0.2 m is placed in a uniform magnetic field of induction $\frac{1}{\pi }$ $\left(\frac{Wb}{{m}^{2}}\right)$ in such a way that its axis makes an angle of ${60}^{°}$ with $\stackrel{\to }{B}$. The magnetic flux linked to the disc will be:
1. 0.02 Wb
2. 0.06 Wb
3. 0.08 Wb
4. 0.01 Wb  Subtopic:  Magnetic Flux |
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NEET - 2008
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If a current is passed through a circular loop of radius R then magnetic flux through a coplanar square loop of side l as shown in the figure (l<<R) is: 1. $\frac{{\mu }_{0}l}{2}\frac{{R}^{2}}{l}$

2. $\frac{{\mu }_{0}I{l}^{2}}{2R}$

3. $\frac{{\mu }_{0}l{\mathrm{\pi R}}^{2}}{2l}$

4. $\frac{{\mu }_{0}{\mathrm{\pi R}}^{2}I}{l}$  Subtopic:  Magnetic Flux |
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The radius of a loop as shown in the figure is 10 cm. If the magnetic field is uniform and has a value 10-2 T, then the flux through the loop will be: 1. $2\mathrm{\pi }×{10}^{-2}\mathrm{Wb}$

2. $3\mathrm{\pi }×{10}^{-4}\mathrm{Wb}$

3. $5\mathrm{\pi }×{10}^{-5}\mathrm{Wb}$

4. $5\mathrm{\pi }×{10}^{-4}\mathrm{Wb}$  Subtopic:  Magnetic Flux |
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What is the dimensional formula of magnetic flux?

1. $\left[\mathrm{M}$ ${\mathrm{L}}^{2}$ ${\mathrm{T}}^{-2}$ ${\mathrm{A}}^{-1}\right]$

2. $\left[\mathrm{M}$ ${\mathrm{L}}^{1}$ ${\mathrm{T}}^{-1}$ ${\mathrm{A}}^{-2}\right]$

3. $\left[\mathrm{M}$ ${\mathrm{L}}^{2}$ ${\mathrm{T}}^{-3}$ ${\mathrm{A}}^{-1}\right]$

4. $\left[\mathrm{M}$ ${\mathrm{L}}^{-2}$ ${\mathrm{T}}^{-2}$ ${\mathrm{A}}^{-2}\right]$  Subtopic:  Magnetic Flux |
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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 |
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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 |
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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 s will be:
1. 0.14 V

2. 0.12 V

3. 0.11 V

4. 0.13 V  Subtopic:  Faraday's Law & Lenz Law |
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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 |
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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 |
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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 |
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AIPMT - 2013
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