A wire of 3 ohm resistance and 15 cm in length is stretched to 45 cm in length. Calculate-
1- New cross sectional area,
2- New resistance,
3- resistivity.
Assume that wire has uniform cross sectional area
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Since the volume remains same
Equating the new and old resistances
We get
New resistance =9×old resistance
=27
New area=old area÷3
0.16
Resistivity remains same
I hope so
Equating the new and old resistances
We get
New resistance =9×old resistance
=27
New area=old area÷3
0.16
Resistivity remains same
I hope so
anuragmittal:
Anyone tell this answer fast
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