Questions
Masses of 3 wires of same metal are in the ratio 1 : 2 : 3 and their lengths are in the ratio 3 : 2 : 1. The electrical resistances are in the ratio
detailed solution
Correct option is D
R ∝ l2m ⇒ R1 : R2 : R3 = l12m1 : l22m2 : l32m3⇒ R1 : R2 : R3 = 91 : 42 : 13 = 27 : 6 : 1Talk to our academic expert!
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In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is 5Ω . The cable is replaced by 6 different insulated copper wires, the radius of each wire is 3 mm . Now the total resistance of the cable will be
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