Questions
Two ends of a copper wire are connected to the terminals of a battery. If the wire is stretched to twice its original length, then power dissipated in the wire. The thermal power dissipated in the wire.
detailed solution
Correct option is C
When the wire is stretched to n times its original length, its resistance becomes n2R.Now, P=V2R.So P'=V2R =V2n2R=Pn2=P22=P4.Talk to our academic expert!
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