Arzeebo Arzeebo

11-07-2017
Physics

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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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Аноним Аноним

11-07-2017

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

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