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प्रश्न
A wire of length 40 cm and area of cross-section 0.1 mm2 has a resistance of 0.8 Ω. Calculate the sp. resistance of the wire.
संख्यात्मक
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उत्तर
l = 40 cm; a = 0.1 mm2; R = 0.8 Ω
1 cm2 = 100 mm2
\[a = 0.1\ \text{mm}^{2} = \frac{0.1}{100}\ \text{cm}^{2} = 0.001\ \text{cm}^{2}\]
Sp. resistance, \[\rho = \frac{Ra}{l}\]
\[= \frac{0.8 \times 0.001}{40}\]
\[= 0.00002\ \Omega\text{cm}\]
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