An electric cable contains a single copper wire of radius 9 mm. It’s resistance is 5 Ω Ω . This cable is replaced by six insulated copper wires, each of radius 3 mm. The resultant resistance of cable will be
Text Solution
Verified by ExpertsThe correct answer is:
A
Initially : 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 
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