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Current Electri...

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  • Question 1
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    At room temperature, copper has free electron density of 8.4 × 1028 per m3. The copper conductor has across-section of 10–6 m2 and carries a current of 5.4 A.The electron drift velocity in copper is

  • Question 2
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    The resistance of a 5 cm long wire is 10 Ω. It is uniformly stretched so that its length becomes 20 cm. The resistance of the wire is

  • Question 3
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    In the figure a carbon resistor has bands of different colours on its body as mentioned in the figure. The value of the resistance is

  • Question 4
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    By increasing the temperature, the specific resistance of a conductor and a semiconductor

  • Question 5
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    Which of the following is vector quantity?

  • Question 6
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    A current of 1 mA is flowing through a copper wire. How many electrons will pass a given point in one second [ e = 1.6 × 10–19Coulomb] ?

  • Question 7
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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 drift velocity will be

  • Question 8
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    If σ1, σ2 and σ3 are the conductance’s of three conductors, then their equivalent conductance, whenthey are joined in series, will be

  • Question 9
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    The resistance of a conductor increases with

  • Question 10
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    Two wires that are made up of two different materials whose specific resistance are in the ratio 2 : 3, length 3 : 4 and area 4 : 5. The ratio of their resistances is

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