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The plot of current \(I~\text{(A)}\) flowing through a metallic conductor versus the applied voltage \(V~\text{(volt)}\) across the ends of a conductor is:

1. | 2. | ||

3. | 4. |

Subtopic: Derivation of Ohm's Law |

79%

From NCERT

NEET - 2022

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A certain wire \(A\) has resistance \(81\) \(\Omega\). The resistance of another wire \(B\) of the same material and equal length but of diameter thrice the diameter of \(A\) will be:

1. | \(81\) \(\Omega\) | 2. | \(9\) \(\Omega\) |

3. | \(729\) \(\Omega\) | 4. | \(243\) \(\Omega\) |

Subtopic: Derivation of Ohm's Law |

73%

From NCERT

NEET - 2023

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A copper wire of radius \(1\) mm contains \(10^{22}\) free electrons per cubic metre. The drift velocity for free electrons when \(10\) A current flows through the wire will be:

(Given, charge on electron = \(1.6\times10^{-19}\) C)

1. \(\frac{6.25\times10^4}{\pi}\) m/s

2. \(\frac{6.25}{\pi}\times10^3\) m/s

3. \(\frac{6.25}{\pi}\) m/s

4. \(\frac{6.25\times10^5}{\pi}\) m/s

(Given, charge on electron = \(1.6\times10^{-19}\) C)

1. \(\frac{6.25\times10^4}{\pi}\) m/s

2. \(\frac{6.25}{\pi}\times10^3\) m/s

3. \(\frac{6.25}{\pi}\) m/s

4. \(\frac{6.25\times10^5}{\pi}\) m/s

Subtopic: Current & Current Density |

71%

From NCERT

NEET - 2023

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When no current is passed through a conductor,

(a) | the free electrons do not move. |

(b) | the average speed of a free electron over a large period of time is zero. |

(c) | the average velocity of a free electron over a large period of time is zero. |

(d) | the average of the velocities of all the free electrons at an instant is zero. |

Choose the correct option:

1. (a) only

2. (b), (c)

3. (c), (d)

4. (a), (d)

Subtopic: Current & Current Density |

56%

From NCERT

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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: Current & Current Density |

59%

From NCERT

NEET - 2015

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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: Current & Current Density |

66%

From NCERT

NEET - 2022

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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: Current & Current Density |

82%

From NCERT

NEET - 2020

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On the basis of electrical conductivity, which one of the following material has the smallest resistivity?

1. | Germanium | 2. | Silver |

3. | Glass | 4. | Silicon |

Subtopic: Derivation of Ohm's Law |

61%

From NCERT

NEET - 2023

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As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity:

1. | increases |

2. | decreases |

3. | remains constant |

4. | may increase or decrease |

Subtopic: Derivation of Ohm's Law |

76%

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The reciprocal of resistance is:

1. | reactance | 2. | mobility |

3. | conductivity | 4. | conductance |

Subtopic: Derivation of Ohm's Law |

79%

From NCERT

NEET - 2022

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