Resistance of a wire is 20 ohm, it is stretched upto, three times of its length, then its new resistance will be
Text Solution
Verified by ExpertsThe correct answer is:
D
wire is stretched, therefore its volume remains unchanged
A 1 I 1 = A 2 I 2
A 1 I = A 2 × 3I
A 2 = 
Ratio of resistance 
= 
× 
= 
× 
= 
= 
= 
⇒ R 2 = 180 Ω Ω
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