JEE · NEET Previous Year Question
A wire of resistance 4 Ω is stretched to twice its original length. The resistance of stretched wire would be:
Topic: NEET PYQ
Answer: C. Full step-by-step solution below.
- A4
- B8
- C16
- D2
Correct answer: C
Solution
(c) Resistance of a wire,…..(i)
When wire is stretched twice, its new length be Then
On sketching volume of the wire remains constant.
or
∴ Resistance of the stretched wire is
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