Questions
we have two wires A and B of the same mass and the same material. The diameter of the wire A is half of that B. If the resistance of wire A is 24 ohm. then the resistance of wire B will be
detailed solution
Correct option is C
Same mass, same material, i.e., volume is the same or Al = constantAlso, R=ρlA⇒R1R2= l1l2 × A2A1= A2A12=d2d14⇒ 24R2 = dd/24 =16 ⇒ R1 = 1.5 ΩTalk 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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