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Series-Parallel Circuits - Technical MCQs

Q1:

What are the branch currents I2 and I3?

A I2 = 4 mA, I3 = 2 mA

B I2 = 4.5 mA, I3 = 2.5 mA

C I2 = 2.5 mA, I3 = 1.5 mA

D I2 = 5.5 mA, I3 = 3.5 mA

ANS:C - I2 = 2.5 mA, I3 = 1.5 mA

Total current I(1):
R(2) and R(3) are together 4k7
This in series with R(1) is 8k7
I(1) = 35/8k7 = 4mA

I(2) = 4*12.5/(12.5+7.5) = 2.5mA
I(3) = 4mA - 2.5mA = 1.5mA