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Current Electricity Test - 35
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Current Electricity Test - 35
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  • Question 1/10
    4 / -1
    An electric wire of length ‘L’ and area of cross-section a has a resistance R ohm. Another wire of the same material having same length and area of cross-section 4a has a resistance of
    Solutions

  • Question 2/10
    4 / -1
    For which of the following the resistance decreases on increasing the temperature?
  • Question 3/10
    4 / -1
    If n, e, τ and m respectively represent the density, charge relaxation time and mass of the electron, then the resistance of a wire of length land area of cross-section A will be
    Solutions

  • Question 4/10
    4 / -1
    Which of the following statements is correct?
  • Question 5/10
    4 / -1
    A certain piece of silver of given mass is to be made like a wire. Which of the following combinations of length (L) and the area of cross-section (A) will lead to the smallest resistance
    Solutions

  • Question 6/10
    4 / -1
    A metal wire of specific resistance 64 × 10–6 ohm-cmand length 198 cm has a resistance of 7 ohm, the radius of the wire will be
    Solutions

  • Question 7/10
    4 / -1
    A copper wire of length 1 m and radius 1 mm is joined in series with an iron wire of length 2 m and radius 3 mm and a current is passed through the wires. The ratio of the current density in the copper and iron wires is
    Solutions

  • Question 8/10
    4 / -1
    For a metallic wire, the ratio V/i (V = the applied potential difference, i = current flowing) is
    Solutions

  • Question 9/10
    4 / -1
    Which of the following has a negative temperature coefficient?
  • Question 10/10
    4 / -1
    The reciprocal of resistance is
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