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JAMB Physics 1984 Question 8

Question 8

Current Electricity

The resistance of a wire depends on

  1. A.the length of the wire
  2. B.the diameter of the wire
  3. C.the temperature of the wire
  4. D.the resistivity of the wire
  5. E.all of the above.
Show the answer and explanation

Answer: E (all of the above.)

Explanation

R = ρL/A, so resistance depends on length, cross-section (diameter) and resistivity, and resistivity changes with temperature.