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The primary and secondary coils of a transformer have \(50\) and \(1500\) turns respectively. If the magnetic flux \(\phi\) linked with the primary coil is given by \(\phi=\phi_0+4t,\) where \(\phi\) is in Weber, *\(t\)* is time in seconds, and \(\phi_0\)_{ }is a constant, the output voltage across the secondary coil is:

1. \(90~\mathrm{V}\)

2. \(120~\mathrm{V}\)

3. \(220~\mathrm{V}\)

4. \(30~\mathrm{V}\)

Subtopic: Â Magnetic Flux |

Â 80%

From NCERT

AIPMT - 2007

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Two coils of self-inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is:

1. 10 mH

2. 6 mH

3. 4 mH

4. 16 mH

Subtopic: Â Mutual Inductance |

Â 73%

From NCERT

AIPMT - 2006

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In which of the following devices, the eddy current effect is not used?

1. | electric heater |

2. | induction furnace |

3. | magnetic braking in train |

4. | electromagnet |

Subtopic: Â Eddy Current |

Â 56%

From NCERT

NEET - 2019

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A \(800\) turn coil of effective area \(0.05~\text{m}^2\) is kept perpendicular to a magnetic field \(5\times 10^{-5}~\text{T}\). When the plane of the coil is rotated by \(90^{\circ}\)$$around any of its coplanar axis in \(0.1~\text{s}\), the emf induced in the coil will be:

1. | \(0.02~\text{V}\) | 2. | \(2~\text{V}\) |

3. | \(0.2~\text{V}\) | 4. | \(2\times 10^{-3}~\text{V}\) |

Subtopic: Â Faraday's Law & Lenz Law |

Â 65%

From NCERT

NEET - 2019

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A circular disc of radius \(0.2~\text{m}\) is placed in a uniform magnetic field of induction \(\frac{1}{\pi}~\text{Wb/m}^{2}\) in such a way that its axis makes an angle of \(60^{\circ}\) with \(\vec{B}.\) The magnetic flux linked with the disc is:

1. \(0.02~\text{Wb}\)

2. \(0.06~\text{Wb}\)

3. \(0.08~\text{Wb}\)

4. \(0.01~\text{Wb}\)

1. \(0.02~\text{Wb}\)

2. \(0.06~\text{Wb}\)

3. \(0.08~\text{Wb}\)

4. \(0.01~\text{Wb}\)

Subtopic: Â Magnetic Flux |

Â 84%

From NCERT

AIPMT - 2008

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A long solenoid has \(500\) turns. When a current of \(2\) A is passed through it, the resulting magnetic flux linked with each turn of the solenoid is \(4\times 10^{-3} \) Wb. The self-inductance of the solenoid is:

1. \(2.5\) H

2. \(2.0\) H

3. \(1.0\) H

4. \(4.0\) H

1. \(2.5\) H

2. \(2.0\) H

3. \(1.0\) H

4. \(4.0\) H

Subtopic: Â Self - Inductance |

Â 79%

From NCERT

AIPMT - 2008

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A rectangular, a square, a circular, and an elliptical loop, all in the \((x\text-y)\) plane, are moving out of a uniform magnetic field with a constant velocity, \(\vec{v}= v\hat{i}.\) The magnetic field is directed along the negative \(z\text-\)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: Â Motional emf |

Â 72%

From NCERT

AIPMT - 2009

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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 emf in the loop when the radius is \(2\) cm is:

1. \(3.2\pi ~\mu \text{V}\)

2. \(4.8\pi ~\mu\text{V}\)

3. \(0.8\pi ~\mu \text{V}\)

4. \(1.6\pi ~\mu \text{V}\)

Subtopic: Â Faraday's Law & Lenz Law |

Â 69%

From NCERT

AIPMT - 2009

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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. \(\dfrac{\pi}{2}~\mu\text{V}\)

4. \(2 ~\mu \text{V}\)

Subtopic: Â Faraday's Law & Lenz Law |

Â 76%

From NCERT

AIPMT - 2010

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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

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