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In an electrical cable there is a single wire of radius 9 mm of Copper. Its resistance is 5 Ω . 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 (l = 1)
  • a)
    7.5 Ω
  • b)
    45 Ω
  • c)
    90 Ω
  • d)
    270 Ω
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
In an electrical cable there is a single wire of radius 9 mm of Copper...
Initially : Resistance of given cable
 .....(i)
Finally : Resistance of each insulated copper wire is
Hence equivalent resistance of cable
On solving equation (i) and (ii) we get Req = 7.5 Ω
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Most Upvoted Answer
In an electrical cable there is a single wire of radius 9 mm of Copper...
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In an electrical cable there is a single wire of radius 9 mm of Copper. Its resistance is 5 Ω . 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 (l = 1)a)7.5 Ωb)45 Ωc)90 Ωd)270 ΩCorrect answer is option 'A'. Can you explain this answer?
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