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Question
Keeping the potential difference constant, the resistance of a circuit is doubled. By how much does the current change?
Solution
We know that V = IR
If V is constant, resistance is doubled R' = 2R.
Then V' = I'R'
V' = V since V is constant`
` V=Txx2xxR`
`T=(v)/(2R)=I/2`
Thus, the current will get reduced to half.
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