An electric curren passed through a circuit containing two wires of the same material, connected In parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3, then the ratio of the currents passing through the wire will be
Correct answer: C. 1/3
- A. 3
- B. 8/9
- C. 1/3
- D. 2
Explanation
To find the ratio of currents in the two wires, we need to use the formula for resistance: R = ρ(L/A), where ρ is resistivity, L is length, and A is the cross-sectional area of the wire. Since the wires are made of the same material, their resistivities are equal.Given that the lengths of the wires are in the ratio 4:3 and their radii in the ratio 2:3, the cross-sectional area A (which is πr²) will be in the ratio (2:3)² = 4:9.Thus, the ratio of resistances R will be (4/3) / (4/9) = 3:1. Since the wires are in parallel, the current is inversely proportional to the resistance. Therefore, the current ratio is 1:3, making option C the correct answer.Option A misapplies the resistance formula, option B miscalculates the impact of the radius, and option D misunderstands the division of current in parallel circuits.
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