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A square loop of side \(1~\text m\) and resistance \(1~\Omega\) is placed in a magnetic field of \(0.5~\text T.\) If the plane of the loop is perpendicular to the direction of the magnetic field, the magnetic flux through the loop is:

1. | \(0\) | 2. | \(2\) weber |

3. | \(0.5\) weber | 4. | \(1\) weber |

Subtopic: Â Magnetic Flux |

Â 67%

From NCERT

NEET - 2022

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In a coil of resistance \(10\) \(\Omega\), the induced current developed by changing magnetic flux through it is shown in the figure as a function of time. The magnitude of change in flux through the coil in Weber is:

1. \(2\)

2. \(6\)

3. \(4\)

4. \(8\)

Subtopic: Â Magnetic Flux |

Â 67%

From NCERT

AIPMT - 2012

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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 88%

From NCERT

AIPMT - 2012

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A circular loop of radius \(\mathrm{R}\), enters a region of uniform magnetic field \(\mathrm{B}\) as shown in the diagram. The field \((\mathrm{B})\) is perpendicular to the plane of the loop while the velocity of the loop,\(\mathrm{v}\), is along its plane. The induced EMF:

1. | increases continuously. |

2. | decreases continuously. |

3. | first increases and then decreases. |

4. | remains constant throughout. |

Subtopic: Â Faraday's Law & Lenz Law |

Â 69%

From NCERT

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A big circular coil of \(1000\) turns and average radius \(10~\text{m}\) is rotating about its horizontal diameter at \(2~\text{rad s}^{-1}\). If the vertical component of earth's magnetic field at that place is \(2\times 10^{-5}~\text{T}\) and electrical resistance of the coil is \(12.56~\Omega,\) then the maximum induced current in the coil will be:

1. | \(2~\text{A}\) | 2. | \(0.25~\text{A}\) |

3. | \(1.5~\text{A}\) | 4. | \(1~\text{A}\) |

Subtopic: Â Faraday's Law & Lenz Law |

Â 55%

From NCERT

NEET - 2022

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The magnetic field, through a closed loop of conducting wire covering an area of \(100\) cm^{2}, is \(5\times10^{-2}\) T and it is uniform and normal to the area. If the field is switched off in a time of \(10\) ms, the average emf induced is:

1. | \(5\) V | 2. | \(0.5\) V |

3. | \(0.05\) V | 4. | \(5\times10^{-4}\) V |

Subtopic: Â Faraday's Law & Lenz Law |

Â 78%

From NCERT

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The figure shows planar loops of different shapes moving out of or into a region of a magnetic field which is directed normally to the plane of the loop away from the reader. Then:

1. | for the rectangular loop abcd, the induced current is clockwise. |

2. | for the triangular loop abc, the induced current is clockwise. |

3. | for the irregularly shaped loop abcd, the induced current is anti-clockwise. |

4. | none of these. |

Subtopic: Â Faraday's Law & Lenz Law |

Â 66%

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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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A square wire loop of resistance \(0.5\) \(\Omega\)/m, having a side \(10\) cm and made of \(100\) turns is suddenly flipped in a magnetic field \(B,\) which is perpendicular to the plane of the loop. A charge of \(2\times10^{-4}
\) C passes through the loop. The magnetic field \(B\) has the magnitude of:

1. \(2\times10^{-6} \) T

2. \(4\times10^{-6} \) T

3. \(2\times10^{-3} \) T

4. \(4\times10^{-3} \) T

1. \(2\times10^{-6} \) T

2. \(4\times10^{-6} \) T

3. \(2\times10^{-3} \) T

4. \(4\times10^{-3} \) T

Subtopic: Â Magnetic Flux |

From NCERT

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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

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