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A wire of resistance 4 ohm is stretched to double its length (area consequently becomes half). Its new resistance becomes:

Question
A wire of resistance 4 ohm is stretched to double its length (area consequently becomes half). Its new resistance becomes:
1 ohm
2 ohm
8 ohm
16 ohm
Answer
16 ohm
Detailed Explanation
R = rl/A. If l doubles and A halves, R becomes 4 times, i.e., 4 x 4 = 16 ohm.
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