Q.

In the given circuit each one of the diodesD1 and D2 has forward resistance of 40 ohm and infinite backward resistance. Each one of the ammeters A1, A2 and A3 has internal resistance 5 ohm. The readings of A1,A2 and A3 are respectively

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a

0.06 A, Zero, 0.04 A

b

Zero, 0.08 A, 0.03 A

c

0.06 A, Zero, 0.06 A

d

0.03 A, 0.08 A, Zero

answer is C.

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Detailed Solution

diode D2  is  in reverse biased so A2 reading is zero, total resistance of the circuit is  100 +50+ 40 +2 x 5 = 200 ohm   current for both A1 and A3 will be same and is equal to 12200=0.06 A
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