The specific resistance of manganin is $50 \times 10^{-8} \…

Physics Current Electricity Specific, Equivalent, Electric Resistance and Resistivity Single Correct MCQ

Published on: September 12, 2026

The specific resistance of manganin is $50 \times 10^{-8} \text{ ohm} \times m$ . The resistance of a cube of length 50 cm will be

$10^{-6}$ ohm

$2.5 \times 10^{-5} ohm$

$10^{-8}$ ohm

$5 \times 10^{-4} \text{ ohm}$

Text Solution

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The correct answer is:

$\mathrm{R} = \frac{\rho l}{A} = 50 \times 10^{-8} \times \frac{50 \times 10^{-2}}{(50 \times 10^{-2})^2} = 10^{-6} \Omega$

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