Calculate the length of a constantan wire of cross- sectional area 4 π x 10-8m2...

WAEC 1992

Calculate the length of a constantan wire of cross- sectional area 4 π x 10^-8m² and resistivity 1.1 x 10^-6 Ω m required to construct a standard resistor of resistance 21 Ω. [Take π = 22/7]

A. 0.42m
B. 2.40 m
C. 6.25 m
D. 183.75 m
E. 590.00 m

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Correct Answer: Option B

Explanation

R = PL/A => L =

RA/P

21 x 4π x 10⁸/1.1 x 10^-6

= 2.40

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Calculate the length of a constantan wire of cross- sectional area 4 π x 10-8m2...

Correct Answer: Option B

Explanation

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