Numerical:- 1. A wire of human material having length L and area of cross section has a resistance of 4 ohm? What could be the resistance of another wire of the same material having the length L/2 and area of cross 2A ?
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R prop l/a
R1/R2 = L1/A1/l2/A2
R1/R2 = L1×a2 / L2×a1
4/R2 = l × 2a/ l/2 × a
4/R2 = 4
R2 = 1ohm
R1/R2 = L1/A1/l2/A2
R1/R2 = L1×a2 / L2×a1
4/R2 = l × 2a/ l/2 × a
4/R2 = 4
R2 = 1ohm
VijayaLaxmiMehra1:
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answer is 1 ohms
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