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Series Circuits

Q1:

In the given circuit, R2 equals _____.

A 100 komega.gif

B 200 komega.gif

C 300 komega.gif

D More information is needed to find R2.

ANS:B - 200 komega.gif

Given voltage at R1 = 4.5v.
Voltage at R3 = i*R3 = (15*10^-6)*(100K) = 1.5v
Voltage at R2 = (9)-(4.5)-(1.5) = 3v.
R2 = v/i = 3/(15*10^-6) = 200K.



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