1.

एक तार का प्रतिरोध 4.0 ओम है । यदि इसे दोहरा करके आधा कर दिया जाये , तो उसका प्रतिरोध कितना हो जायेगा ?

Answer» ` R = rho l/A , (R_(1))/(R_(2)) = (l_(1))/(l_(2)) xx(A_(2))/(A_(1)) rArr 4/(R_(2))`
`= (l_(1))/((l_(1)//2))xx(2A_(1))/(A_(1)) = 4 rArrR_(2) = 1 Omega `


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