For the circuit shown below, the value of R is—

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For the circuit shown below, the value of R is—

1. 30Ω
2. 60Ω
3. 40Ω
4. None of these

Correct Option: A

The given circuit

Applying KVL in the loop
60 – 30I – 30 – 20 + 60 – 40I = 0
or
70 = 70I
or
I = 1A
R = 30V/1A = 30Ω.