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Question

Find the current I in the given circuit .

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A
1/25 A
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B
1/10 A
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C
1/20 A
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D
1/5 A
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Solution

The correct option is B 1/10 A
Total resistance in the circuit is, The resistance in the upper part,
Req=R1+R2=60Ω
Now this resistance is in parallel with the 30Ω
so, total resistance given by,
1RT=1Req+1R2
1RT=160+130
RT=20Ω
Therefore, current in the circuit is,
I=VR=220=110 A

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