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  9. Q350

RRB Group D (Level-1 posts) 2022 · Question 350 of 598

Two wires A and B are made of the same material and have the same length but different cross-sectional areas. If the resistance of wire A is 9 times the resistance of wire B, the ratio of the radius of wire A to that of wire B is:

  1. A3 ∶ 1
  2. B1 ∶ 9
  3. C1 ∶ 3Correct
  4. D9 ∶ 1

Answer: C. 1 ∶ 3

Explanation

Resistance is inversely proportional to the square of the radius. Given that the resistance of A is 9 times that of B, the radius ratio is √9 = 3, so the radius of A to B is 1 : 3.

Source: RRB Group D 2022 Prev. Yr. Paper (18 Aug 2022) (Shift 2) - Prepp · reliable-secondary

← Q349View full paper (598 questions)Q351 →

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