JEE Main 2022 · 25 Jun · Shift 2 · Physics Q58

← JEE Main 2022 · 25 Jun · Shift 2

PhysicsInteger+4 / -1Question 58 of 90

The length of a given cylindrical wire is increased to double of its original length. The percentage increase in the resistance of the wire will be ______%.

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Answer and worked solution

Official answer: 300

Fixed volume. Doubling $L$ halves $A$ , so $R=\rho\dfrac LA$ becomes $4R$ : an increase of 300%.

Answer: 300

Topics:Ohm's law and resistivity

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JEE Main 2022 · 25 Jun · Shift 2, Physics question 58