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