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A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to:

Choose the correct statement\((\mathrm s )\) from the options given below:

1. \(\mathrm A\) and \(\mathrm C\) only

2. \(\mathrm A\), \(\mathrm C\) and \(\mathrm D\) only

3. \(\mathrm C\) only

4. \(\mathrm B\) and \(\mathrm D\) only

\(\mathrm A.\) | hold the sheet there if it is magnetic. |

\(\mathrm B.\) | hold the sheet there if it is non-magnetic. |

\(\mathrm C.\) | move the sheet away from the pole with uniform velocity if it is conducting. |

\(\mathrm D.\) | move the sheet away from the pole with uniform velocity if it is both, non-conducting and non-polar. |

1. \(\mathrm A\) and \(\mathrm C\) only

2. \(\mathrm A\), \(\mathrm C\) and \(\mathrm D\) only

3. \(\mathrm C\) only

4. \(\mathrm B\) and \(\mathrm D\) only

Subtopic: Faraday's Law & Lenz Law |

From NCERT

NEET - 2024

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An ideal inductor-resistor-battery circuit is switched on at \(t=0~\text{s}\). At time \(t\), the current is \(i=i_0\left(1-e^{\left(-\frac{t}{\tau}\right)}\right)\text{A}\), where \(i_0\) is the steady-state value. The time at which the current becomes \(0.5i_0\) is: [Given \(\text{ln}(2)= 0.693\)]

1. \(6.93 \times 10^3 ~\text{s}\)

2. \(6.93~\text{ms}\)

3. \(69.3~\text{s}\)

4. \(6.93~\text{s}\)

Subtopic: LR circuit |

60%

From NCERT

NEET - 2024

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A conducting circular loop of face area \(2.5 \times 10^{-3}~\text{m}^2\) is placed perpendicular to a magnetic field which varies as \(B=0.5\sin(100 \pi t)~\text{T}\). The magnitude of induced emf at time \(t= 0~\text{s}\) is:

1. | \(0.125 \pi~ \text{mV}\) | 2. | \(125 \pi ~\text{mV}\) |

3. | \(125 \pi~\text{V}\) | 4. | \(12.5 \pi~\text{mV}\) |

Subtopic: Faraday's Law & Lenz Law |

63%

From NCERT

NEET - 2024

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A rod of length \(L\) rotates with a small uniform angular velocity \(\omega\) about its perpendicular bisector. A uniform magnetic field \(\mathrm B\) exists parallel to the axis of rotation. The potential difference between the centre of the rod and an end is:

1. \(\large\frac{B\omega L^2}{8}\)

2. \(\large\frac{B\omega L^2}{2}\)

3. \(\large\frac{B\omega L^2}{4}\)

4. zero

1. \(\large\frac{B\omega L^2}{8}\)

2. \(\large\frac{B\omega L^2}{2}\)

3. \(\large\frac{B\omega L^2}{4}\)

4. zero

Subtopic: Motional emf |

From NCERT

NEET - 2024

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The magnetic energy stored in an inductor of inductance \(4~\mu\text{H}\) carrying a current of \(2~\text{A}\) is:

1. \(8~\mu \text{J}\)

2. \(4~\mu \text{J}\)

3. \(4~\text{mJ}\)

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

1. \(8~\mu \text{J}\)

2. \(4~\mu \text{J}\)

3. \(4~\text{mJ}\)

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

Subtopic: Self - Inductance |

73%

From NCERT

NEET - 2023

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An emf is generated by an ac generator having \(100\) turn coil, of loop area \(1\) m^{2}. The coil rotates at a speed of one revolution per second and placed in a uniform magnetic field of \(0.05\) T perpendicular to the axis of rotation of the coil. The maximum value of emf is:

1. \(3.14\) V

2. \(31.4\) V

3. \(62.8\) V

4. \(6.28\) V

1. \(3.14\) V

2. \(31.4\) V

3. \(62.8\) V

4. \(6.28\) V

Subtopic: Motional emf |

72%

From NCERT

NEET - 2023

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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 |

67%

From NCERT

NEET - 2022

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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: Faraday's Law & Lenz Law |

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: Self - Inductance |

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: Mutual Inductance |

73%

From NCERT

NEET - 2022

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