Select Chapter Topics:

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

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

Subtopic: Â Magnetic Flux |

Â 67%

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NEET - 2022

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

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

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

3. \(1.5~\text{A}\)

4. \(1~\text{A}\)

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 current in an inductor of self-inductance \(4~\text{H}\) changes from \(4~ \text{A}\) to \(2~\text{A}\) in \(1~ \text s\). The emf induced in the coil is:

1. \(-2~\text{V}\)

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

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

4. \(8~\text{V}\)

Subtopic: Â Self - Inductance |

Â 83%

From NCERT

NEET - 2022

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The dimensions of mutual inductance \((M)\) are:

1. \(\left[M^2LT^{-2}A^{-2}\right]\)

2. \(\left[MLT^{-2}A^{2}\right]\)

3. \(\left[M^{2}L^{2}T^{-2}A^{2}\right]\)

4. \(\left[ML^{2}T^{-2}A^{-2}\right]\)

Subtopic: Â Mutual Inductance |

Â 73%

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%

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A straight horizontal wire \(\mathrm{AB}\) of length \(l\) falls from rest under gravity. A uniform horizontal magnetic field \(B\) acts perpendicular to the plane of motion of \(\mathrm{AB}\), as shown. The induced emf across \(\mathrm{AB}\), \(E\), is proportional to:

1. | \(B\) | 2. | \(l\) |

3. | time, \(t\) | 4. | all of the above |

Subtopic: Â Motional emf |

Â 83%

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An \(L\)-shaped rod \((ABC;AB=BC=a)\) moves in its own plane with a velocity \(v\) parallel to \(AB.\) There is a uniform magnetic field \(B\) acting into the plane as shown. The emf developed between \(A,C\) is:

1. \(Bav\)

2. \(\sqrt2Bav\)

3. \(\frac{Bav}{2}\)

4. zero

1. \(Bav\)

2. \(\sqrt2Bav\)

3. \(\frac{Bav}{2}\)

4. zero

Subtopic: Â Motional emf |

Â 55%

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A conducting circular wire of radius \(r\) is moving with constant velocity \(v\) towards the right in a uniform magnetic field \(B.\) We consider two points \(X,Y\) such that chord \(XY\) is perpendicular to the velocity \(v\) and is at a distance \(x\) from the centre \((O)\) of the circle. The EMF induced between \(X,Y\) is \(\varepsilon.\) Then, \(\varepsilon\) is proportional to:

1. \(x\)

2. \(\sqrt{r^2-x^2}\)

3. \(r\)

4. \(x\sqrt{r^2-x^2}\)

1. \(x\)

2. \(\sqrt{r^2-x^2}\)

3. \(r\)

4. \(x\sqrt{r^2-x^2}\)

Subtopic: Â Motional emf |

Â 73%

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The self-inductance of a long solenoid of cross-section \(A,\) total length \(L\) and total number of turns \(N,\) is (approximately):

1. | \(\dfrac{\mu_0A}{L}\cdot N\) | 2. | \(\dfrac{\mu_0A}{L}\cdot N^2\) |

3. | \(\dfrac{\mu_0L^3}{A}\cdot N\) | 4. | \(\dfrac{\mu_0L^3}{A}\cdot N^2\) |

Subtopic: Â Self - Inductance |

Â 79%

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A straight horizontal wire of mass \(m\) and length \(l,\) and having a negligible resistance can slide freely on a pair of conducting parallel rails, placed vertically. The rails are connected at the top by a capacitor \(C.\) A uniform magnetic field \(B\) exists in the region, perpendicular to the plane of the rails. The wire:

1. | falls with uniform velocity. |

2. | \(g\). | accelerates down with acceleration less than

3. | \(g\). | accelerates down with acceleration equal to

4. | moves down and eventually comes to rest. |

Subtopic: Â Motional emf |

Â 69%

From NCERT

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