If the potential difference across ends of a metallic wire is doubled, the drift velocity of charge carriers will become:

1. double

2. half

3. four times

4. one-fourth

Subtopic: Â Current & Current Density |

Â 84%

From NCERT

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The current in a wire varies with time according to the relation \(i = (3+2t)~\text{A}\). The amount of charge passing a cross section of the wire in the time interval \(t=0\) to \(t = 4.0~\text{s}\) would be: (where \(t\) is time in seconds)

1. | \(28\) C | 2. | \(30.5\) C |

3. | \(8\) C | 4. | \(82\) C |

Subtopic: Â Current & Current Density |

Â 85%

From NCERT

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The current in a wire varies with time according to the equation \(I=(4+2t),\) where \(I\) is in ampere and \(t\) is in seconds. The quantity of charge which has passed through a cross-section of the wire during the time \(t=2\) s to \(t=6\) s will be:

1. | \(60\) C | 2. | \(24\) C |

3. | \(48\) C | 4. | \(30\) C |

Subtopic: Â Current & Current Density |

Â 83%

From NCERT

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A charged particle having drift velocity of \(7.5\times10^{-4}~\text{ms}^{-1}\) in an electric field of \(3\times10^{-10}~\text{Vm}^{-1}\), has mobility of:

1. \(2.5\times 10^{6}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)

2. \(2.5\times 10^{-6}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)

3. \(2.25\times 10^{-15}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)

4. \(2.25\times 10^{15}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)

Subtopic: Â Current & Current Density |

Â 82%

From NCERT

NEET - 2020

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Drift velocity \(v_d\) varies with the intensity of electric field as per the relation:

1. \(v_{d} \propto E\)

2. \(v_{d} \propto \frac{1}{E}\)

3. \(v_{d}= \text{constant}\)

4. \(v_{d} \propto E^2\)

Subtopic: Â Current & Current Density |

Â 78%

From NCERT

PMT - 1981

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The drift velocity of free electrons in a conductor is \(v\) when a current \(i\) is flowing in it. If both the radius and current are doubled, then the drift velocity will be:

1. \(v\)

2. \(\frac{v}{2}\)$$

3. \(\frac{v}{4}\)$$

4. \(\frac{v}{8}\)

Subtopic: Â Current & Current Density |

Â 72%

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When the potential difference applied in a conductor is doubled and also the length of the conductor is halved, the drift speed of electrons in the conductor will:

1. | not change |

2. | be halved |

3. | be four times |

4. | be doubled |

Subtopic: Â Current & Current Density |

Â 66%

From NCERT

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A copper wire of length \(10\) m and radius \(\left({10^{-2}/\sqrt{\pi}}\right)\) m has an electrical resistance of \(10~\Omega.\) The current density in the wire for an electric field strength of \(10\) (V/m) is:

1. \(10^{5}\) A/m^{2}

2. \(10^{4}\) A/m^{2}

3. \(10^{6}\) A/m^{2}

4. \(10^{-5}\) A/m^{2}

1. \(10^{5}\) A/m

2. \(10^{4}\) A/m

3. \(10^{6}\) A/m

4. \(10^{-5}\) A/m

Subtopic: Â Current & Current Density |

Â 66%

From NCERT

NEET - 2022

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Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity which remains constant along the conductor is:

1. | current density | 2. | current |

3. | drift velocity | 4. | electric field |

Subtopic: Â Current & Current Density |

Â 59%

From NCERT

NEET - 2015

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A current passes through a wire of variable cross-section in steady-state as shown. Then incorrect statement is:

1. | Current density increases in the direction of the current. |

2. | Potential increases in the direction of the current. |

3. | Electric field increases in the direction of the current. |

4. | Drift speed increases in the direction of the current. |

Subtopic: Â Current & Current Density |

Â 55%

From NCERT

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