Physics Circle home Student Login

Home›Chapters›Current Electricity PYQs›Ohm's Law, Resistivity & Temperature›Question 15

JEE Main 2023 (25 Jan, Shift 2) · Ohm's Law, Resistivity & Temperature

Ohm's Law, Resistivity & Temperature question from JEE Main 2023 (25 Jan, Shift 2)

Q15JEE Main 2023 · 25 JAN · SHIFT 2Easy

Ohm's Law, Resistivity & Temperature

The resistance of a wire is 5 Ω\Omega. Its new resistance in ohm if stretched to 5 times of its original length will be:

Show answer and solution

Answer: (d)

  1. Stretching at constant volume: R∝l2R \propto l^2.
  2. R′=5×52=125 ΩR' = 5 \times 5^2 = 125\ \Omega
  3. So the answer is (d) 125125.
Report a mistake

More questions on Ohm's Law, Resistivity & Temperature