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Question

In the circuit shown, the reading of ammeter is 2 A. The ammeter has negligible resistance. The value of R equals


A
2 Ω
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B
4 Ω
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C
6 Ω
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D
8 Ω
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Solution

The correct option is C 6 Ω
R,2R and 3R are in parallel.
Let equivalent resistance of R,2R and 3R be R.
R=6R11
Rtotal=5R11+R=5R11+6R11=R

Since I=VRtotal
2=12R
R=6 Ω
Hence, the correct answer is (C).

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