Q. 28
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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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