1.

Which of the following wires, all made of the same material, has the highest resistance?

Answer»

L= 100 CM, r = 0.1 cm
l = 200 cm, r = 0.2 cm
l= 300 cm, r = 0.3 cm
l = 400 cm, r = 0.4 cm

Solution :SINCE`(1)/( A ( =pi r^2))`is maximumfor l =100 cm , thereforeitsvalueis maximum


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