If each diode in figure has a forward bias resistance of 25 Ω and infinite resistance in reverse bias, what will be the values of the currents I1, I2, I3and I4?

If each diode in figure has a forward bias resistance of 25 Ω and infinite resistance in reverse bias, what will be the values of the currents I1, I2, I3and I4?

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1 Answer
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This is a Long Answer Type Questions as classified in NCERT Exemplar
forward biased resistance = 25ohm
Reverse biased resistance = infinity
As CD branch is reverse biased having infinite resistance.
So I3= 0
Resistance in branch AB= 25+125= 150 ohm (R1)
Resistance in branch EF= 25+125= 150 ohm (R2)
They both are in parallel
So
R= 75ohm
So total resistance = 25+75= 100ohm
Current = V/R= 5/100=0.05A
I1=I2+I3+I4
I1=I4+I2
Here the resistance R1 and R2 is same
I4=I2
I1= 2I2
I2= I1/2=0.05/2=0.025A
I4= 0.025A
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