A wire of radius r has resistance R. If it is stretched to the wire of r2 radius, then…
Physics · Class 12 · CBSE — Current Electricity
A wire of radius r has resistance R. If it is stretched to the wire of \(\frac r2\) radius, then the resistance becomes:
- 2 R
- 4 R
- 16 R
- Zero
Answer
(C) 16 R
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