In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is 5 Ω 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
Text Solution
Verified by ExpertsThe correct answer is:
A
Initiall: Resistance of given cable
... (i)
Finally: Resistance of each insulated copper wire is
.
Hence equivalent resistance of cable 
….(ii)
On solving equation (i) and (ii) we get R eq = 7.5 Ω Ω
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