Resistance of an electrical conductor is proportional to its (where, l = length and A = crosssectional area of the conductor)________________?
Correct answer: D. Both A. & B.
- A. A
- B. l
- C. A2
- D. Both A. & B.
Explanation
For a uniform conductor, resistance is given by R = ρl/A, so it increases with length and decreases with cross-sectional area. Therefore it is directly proportional to l, not A, making both listed quantities applicable in the intended sense.
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