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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: Â 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: Â LR circuit |

Â 59%

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: Â Faraday's Law & Lenz Law |

Â 64%

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: Â Motional emf |

From NCERT

NEET - 2024

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Let us consider two solenoids \(A\) and \(B,\) made from the same magnetic material of relative permeability \(\mu_{r}\) and equal area of cross-section. Length of \(A\) is twice that of \(B\) and the number of turns per unit length in \(A\) is half that of \(B.\) The ratio of self inductances of the two solenoids, \(L_A:L_B\) is:

1. \(1:2\)

2. \(2:1\)

3. \(8:1\)

4. \(1:8\)

1. \(1:2\)

2. \(2:1\)

3. \(8:1\)

4. \(1:8\)

Subtopic: Â Self - Inductance |

Â 55%

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: Â Self - Inductance |

Â 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: Â Motional emf |

Â 71%

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: Â Magnetic Flux |

Â 66%

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: 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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