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Class 10 Science Medium Mcq English Medium

A wire of length l and area A has resistance 4 ohm. Another wire of the same material has length l/2 and area 2A. Its resistance is:

Question
A wire of length l and area A has resistance 4 ohm. Another wire of the same material has length l/2 and area 2A. Its resistance is:
16 ohm
4 ohm
1 ohm
0.5 ohm
Answer
1 ohm
Detailed Explanation
R2 = r(l/2)/(2A) = (1/4)r(l/A) = (1/4) x 4 ohm = 1 ohm.
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