Answer :


Net potential difference across arm PQ is negative.

The diode is reverse biased.

No current flows through arm PQ

Net resistance = (R + 12) Ω

(a) R=12Ω
Net resistance =12+12 =24Ω
Current= (4V+6V)/24Ω = 0.42A

(b) R=48Ω
Net resistance=48+12 = 60Ω
Current= (4V+6V)/60Ω = 0.16A

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