Two circuits have coefficient of mutual induction of \(0.09\) henry. Average emf induced in the secondary by a change of current from \(0\) to \(20\) ampere in \(0.006\) second in the primary will be:

1. \(120\) V

2. \(80\) V

3. \(200\) V

4. \(300\) V

Subtopic: Â Mutual Inductance |

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A pair of adjacent coils has a mutual inductance of \(1.5\) H. If the current in one coil changes from \(0\) to \(20\) A in \(0.5\) s, what is the change of flux linkage with the other coil?

1. | \(35\) Wb | 2. | \(25\) Wb |

3. | \(30\) Wb | 4. | \(20\) Wb |

Subtopic: Â Mutual Inductance |

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With the decrease of current in the primary coil from \(2\) A to zero in \(0.01\) s, the emf generated in the secondary coil is \(1000~\text{V}\). The mutual inductance of the two coils is:

1. \(1.25\) H

2. \(2.50\) H

3. \(5.00\) H

4. \(10.00\) H

Subtopic: Â Mutual Inductance |

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The coefficient of mutual inductance between two coils depends upon:

1. | medium between coils |

2. | separation between coils |

3. | orientation of coils |

4. | All of these |

Subtopic: Â Mutual Inductance |

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Two coils of \(10\) turns each are arranged such that the mutual inductance between them is \(150\) mH. The magnetic flux linked through one coil when \(2\) amperes current will flow in another coil, will be:

1. \(1\times 10^{-3}~\text{Wb}\)

2. \(10\times 10^{-3}~\text{Wb}\)

3. \(20\times 10^{-3}~\text{Wb}\)

4. \(30\times 10^{-3}~\text{Wb}\)

Subtopic: Â Mutual Inductance |

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Two coils have a mutual inductance of \(5\) mH. The current changes in the first coil according to the equation \(I=I_{0}\cos\omega t,\) where \(I_{0}=10~\text{A}\) and \(\omega = 100\pi ~\text{rad/s}\). The maximum value of emf induced in the second coil is:

1. \(5\pi~\text{V}\)

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

3. \(4\pi~\text{V}\)

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

Subtopic: Â Mutual Inductance |

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Two circular coils can be arranged in any of the three situations shown in the figure. Their mutual inductance will be:

1. | maximum in the situation (A). |

2. | maximum in the situation (B). |

3. | maximum in the situation (C). |

4. | the same in all situations. |

Subtopic: Â Mutual Inductance |

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Two coaxial coils are very close to each other and their mutual inductance is \(5\) mH. If a current \(50\sin(500 t)\) is passed in one of the coils, then the peak value of induced emf in the secondary coil will be:

1. | \(5000\) V | 2. | \(500\) V |

3. | \(150\) V | 4. | \(125\) V |

Subtopic: Â Mutual Inductance |

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A small square loop of wire of side \(l\) is placed inside a large square loop of side \(L\) \((L>>l)\). If the loops are coplanar and their centres coincide, the mutual inductance of the system is directly proportional to:

1. | \(\dfrac{L}{l}\) | 2. | \(\dfrac{l}{L}\) |

3. | \(\dfrac{L^2}{l}\) | 4. | \(\dfrac{l^2}{L}\) |

Subtopic: Â Mutual Inductance |

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A straight solenoid has \(50\) turns per cm in primary coil and \(200\) turns in the secondary coil. The area of cross-section of the solenoid is \(4\) cm^{2}. Calculate the mutual inductance.

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

2. \(5.0\times 10^{-4}~\text{H}\)

3. \(2.5~\text{H}\)

4. \(2.5\times 10^{-4}~\text{H}\)

Subtopic: Â Mutual Inductance |

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