A wire of resistance 3 ohm and length 30 cm. Assuming that it has a uniform cross section,what wil be it's new resistance
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- Resistance R=3 ohm
- New Length=30cm=3×I
- R=P× 1/A
new resistance with streching lenghth will increase & area of cross-section will decrease in the same.
- R=P×3/A/3
THEREFORE, R=9P×1/A=9R
- R=9×3=27n
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