The magnetic flux linked with a coil varies with time as \(\phi = 2t^2-6t+5,\) where \(\phi \) is in Weber and \(t\) is in seconds. The induced current is zero at:

1. | \(t=0\) | 2. | \(t= 1.5~\text{s}\) |

3. | \(t=3~\text{s}\) | 4. | \(t=5~\text{s}\) |

Subtopic: Faraday's Law & Lenz Law |

90%

From NCERT

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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 \(\omega\). The maximum value of the emf induced in it is:

1. \(\frac{NBA}{\omega}\)

2. \(NBAω\)

3. \(\frac{NBA}{\omega^{2}}\)

4. \(NBAω^{2}\)

Subtopic: Faraday's Law & Lenz Law |

88%

From NCERT

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In a circuit with a coil of resistance \(2~\Omega\), the magnetic flux changes from \(2.0\) Wb to \(10.0\) Wb in \(0.2~\text{s}\). The charge that flows in the coil during this time is:

1. \(5.0~\text{C}\)

2. \(4.0~\text{C}\)

3. \(1.0~\text{C}\)

4. \(0.8~\text{C}\)

Subtopic: Faraday's Law & Lenz Law |

89%

From NCERT

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The current in a coil varies with time \(t\) as \(I= 3 t^{2} +2t\). If the inductance of coil be \(10\) mH, the value of induced emf at \(t=2~\text{s}\) will be:

1. \(0.14~\text{V}\)

2. \(0.12~\text{V}\)

3. \(0.11~\text{V}\)

4. \(0.13~\text{V}\)

Subtopic: Faraday's Law & Lenz Law |

87%

From NCERT

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A coil having an area \(A_0\) is placed in a magnetic field which changes from \(B_0~\text{to}~4B_0\) 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. \(\frac{4 B_{0}}{A_{0} t}\)

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 |

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 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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Given below are two statements:

Assertion (A): |
The bar magnet falling vertically along the axis of the horizontal coil will be having acceleration less than \(g.\) |

Reason (R): |
Clockwise current induced in the coil. |

1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |

2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |

3. | (A) is True but (R) is False. |

4. | Both (A) and (R) are False. |

Subtopic: Faraday's Law & Lenz Law |

76%

From NCERT

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In the given magnetic flux versus time graph, the magnitude of emf induced in the loop at \(t=3\) s is:

1. \(5\) V

2. \(4\) V

3. \(3\) V

4. zero

1. \(5\) V

2. \(4\) V

3. \(3\) V

4. zero

Subtopic: Faraday's Law & Lenz Law |

74%

From NCERT

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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 |

69%

From NCERT

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