Questions
Two wires A and B of same material and same mass have radius 2r and r. If resistance of wire A is then resistance of B will be
detailed solution
Correct option is A
R=ρ lA and mass m - volume (V) x density (Al) dSince wires have same material so ρ and d is same for both.Also they have same mass ⇒ Al = constant⇒l∝lA⇒ R1R2 = l1l2 × A2A1 = A2A12 = r2r14⇒ 34R2 =r2r4⇒ R2 = 544 ΩTalk to our academic expert!
Similar Questions
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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