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An electron moves on a straight-line path \(XY\) as shown. The \(\mathrm{abcd}\) is a coil adjacent to the path of electrons. What will be the direction of current if any, induced in the coil?

1. | \(\mathrm{abcd}\) |

2. | \(\mathrm{adcb}\) |

3. | The current will reverse its direction as the electron goes past the coil |

4. | No current included |

Subtopic: Â Faraday's Law & Lenz Law |

Â 74%

From NCERT

NEET - 2015

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A conducting square frame of side \(a\) and a long straight wire carrying current \(I\) are located in the same plane as shown in the figure. The frame moves to the right with a constant velocity \(v.\) The emf induced in the frame will be proportional to:

1. \( \frac{1}{x^2} \)

2. \( \frac{1}{(2 x-a)^2} \)

3. \( \frac{1}{(2 x+a)^2} \)

4. \(\frac{1}{(2 x-a)(2 x+a)}\)

Subtopic: Â Motional emf |

Â 72%

From NCERT

NEET - 2015

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A thin semicircular conducting the ring \((PQR)\) of radius \(r\) is falling with its plane vertical in a horizontal magnetic field \(B,\) as shown in the figure. The potential difference developed across the ring when it moves with speed \(v\) is:

1. | zero |

2. | \(Bv\pi r^{2}/2\) and \(P\) is at a higher potential |

3. | \(\pi rvB\) and \(R\) is at a higher potential |

4. | \(2BvR\) and \(R\) is at higher potential |

Subtopic: Â Motional emf |

Â 74%

From NCERT

AIPMT - 2014

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A coil of self-inductance \(L\) is connected in series with a bulb \(B\) and an AC source. The brightness of the bulb decreases when:

1. | number of turns in the coil is reduced. |

2. | a capacitance of reactance \(X_C = X_L\) is included in the same circuit. |

3. | an iron rod is inserted in the coil. |

4. | frequency of the AC source is decreased. |

Subtopic: Â Self - Inductance |

Â 67%

From NCERT

AIPMT - 2013

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A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced emf is:

1. | twice per revolution. |

2. | four times per revolution. |

3. | six times per revolution. |

4. | once per revolution. |

Subtopic: Â Faraday's Law & Lenz Law |

Â 74%

From NCERT

AIPMT - 2013

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A current of \(2.5\) A flows through a coil of inductance \(5\) H. The magnetic flux linked with the coil is:

1. \(0.5\) Wb

2. \(12.5\) Wb

3. zero

4. \(2\) Wb

1. \(0.5\) Wb

2. \(12.5\) Wb

3. zero

4. \(2\) Wb

Subtopic: Â Self - Inductance |

Â 84%

From NCERT

NEET - 2013

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A coil of resistance \(400~\Omega\) is placed in a magnetic field. The magnetic flux \(\phi~\text{(Wb)}\) linked with the coil varies with time \(t~\text{(s)}\) as \(\phi=50t^{2}+4.\) The current in the coil at \(t=2~\text{s}\) is:$$

1. \(0.5~\text{A}\)

2. \(0.1~\text{A}\)

3. \(2~\text{A}\)

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

Subtopic: Â Faraday's Law & Lenz Law |

Â 88%

From NCERT

AIPMT - 2012

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The current (\(I\)) in the inductance is varying with time (\(t\)) according to the plot shown in the figure.

Which one of the following is the correct variation of voltage with time in the coil?

1. | 2. | ||

3. | 4. |

Subtopic: Â Self - Inductance |

Â 73%

From NCERT

AIPMT - 2012

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In a coil of resistance \(10\) \(\Omega\), the induced current developed by changing magnetic flux through it is shown in the figure as a function of time. The magnitude of change in flux through the coil in Weber is:

1. \(2\)

2. \(6\)

3. \(4\)

4. \(8\)

Subtopic: Â Magnetic Flux |

Â 67%

From NCERT

AIPMT - 2012

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The current \(i\) in a coil varies with time as shown in the figure. The variation of induced emf with time would be:

1. | 2. | ||

3. | 4. |

Subtopic: Â Faraday's Law & Lenz Law |

Â 69%

From NCERT

AIPMT - 2011

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