A wire of lenth 150cm diameter 0.03cm and a resistance of 24 calculate the resistance R of a wire of the same material of length 70cm and diameter 0.4mm
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For same material the resistivity is same
So let it be p
R = pL/A where L and A are length and area respectively
Given:
24 = p × 150cm / π(0.015)²
R = p × 70 / π(0.02)²
Dividing both :
24/R = 150 × (0.02)² / 70 × (0.015)²
R = 6.3
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