A wire of resistivity 4.40 x 10-5\(\Omega\) cm has a cross sectional area of 7.50...

WAEC 2009

A wire of resistivity 4.40 x 10^-5\(\Omega\) cm has a cross sectional area of 7.50 x 10^-4 cm². Calculate the length of the wire that will be required to make a 4.0\(\Omega\) resistor

A. 82.50 cm
B. 68.18cm
C. 15.90cm
D. 11.95cm

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Correct Answer: Option B

Explanation

L = \(\frac{R.A}{e} = \frac{4 \times 7.50 \times 106{-4}}{4.40 \times 10^{-5}} = 68.18cm\)

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A wire of resistivity 4.40 x 10-5\(\Omega\) cm has a cross sectional area of 7.50...

Correct Answer: Option B

Explanation

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