resistavity of iron wire 20×10⁶ohm cm and its cross -sectional area is 0.9cm² . if its resistance is 118ohm, then find out the length of wire .
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Explanation:
given, R= 118 ohm
p= 20× 10^6 ohm CM
A= 0.9 cm2
By applying formula
p= RA/l
l= RA/p
solve it and u will get the answer
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