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A wire of 3Ω resistance and 15 cm length is stretched to 45 cm length. Calculate the new cross sectional area.
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A wire of 3Ω resistance and 15 cm length is stretched to 45 cm length. Calculate the new cross sectional area.

User Punit Patel
by
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1 Answer

4 votes
R = rho *(L/A)

as rho is fixed , so
for fixed resistance, L is inversely propostional to A

so, new cross sectional area will be 1/3 time of actual one..


hope it helped
User Madepiet
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