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AP EAMCET2007PhysicsCurrent Electricity

An aluminium (resistivity =2.2 10⁻⁸ -m) wire of a diameter 1.4 ~mm is used to make a 4 resistor. The length of the wire is

Options

  1. A220 ~m
  2. B1000 ~m
  3. C280 ~m
  4. D1 ~m

Correct answer

C. 280 ~m

Step-by-step solution

Length of the wire is array rl l & = R A l & l & 4 (0.7 10⁻³ )^2 2.2 10⁻⁸ & =280 ~m array

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