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प्रश्न
What should be the length of nichrome wire of resistance 5.6 Ω, if the length of a similar wire is 80 cm and its resistance is 4.2 Ω?
संख्यात्मक
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उत्तर
l1 = ?; R1 = 5.6 Ω; l2 = 80 cm; R2 = 4.2 Ω
\[ \frac{\text{R}_{1}}{\text{R}_{2}}=\frac{l_{1}}{l_{2}}\]
\[l_{1}=\frac{\text{R}_{1}}{\text{R}_{2}} \cdot l_{2}\]
\[=\frac{5.6}{4.2}\times{80}\]
= 106.67 cm
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