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A square loop of side \(1\) m and resistance \(1\) \(\Omega\) is placed in a magnetic field of \(0.5\) 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: Magnetic Flux |

63%

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: Magnetic Flux |

65%

From NCERT

AIPMT - 2012

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

1. \(0.5\) A

2. \(0.1\) A

3. \(2\) A

4. \(1\) A

Subtopic: Magnetic Flux |

87%

From NCERT

AIPMT - 2012

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A circular loop of radius R, enters a region of uniform magnetic field B as shown in the diagram. The field (B) is perpendicular to the plane of the loop while the velocity of the loop, 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: Faraday's Law & Lenz Law |

68%

From NCERT

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

1. \(2\) A

2. \(0.25\) A

3. \(1.5\) A

4. \(1\) A

1. \(2\) A

2. \(0.25\) A

3. \(1.5\) A

4. \(1\) A

Subtopic: Faraday's Law & Lenz Law |

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

1. \(5\) V

2. \(0.5\) V

3. \(0.05\) V

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

Subtopic: Faraday's Law & Lenz Law |

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: Faraday's Law & Lenz Law |

63%

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

1. \(2\pi ~\mu\)V

2. \(\pi ~\mu\)V

3. \(\frac{\pi}{2}~\mu\)V

4. \(2 \mu \) V

Subtopic: Faraday's Law & Lenz Law |

74%

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: 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 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 |

74%

From NCERT

AIPMT - 2013

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