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## Homework Statement

[PLAIN]http://img156.imageshack.us/img156/2420/physicsm.jpg [Broken]

sorry for the image, i made it very quickly

in the following circuit find

a) the current in R

b) R

c) Emf

d) if we cut the circuit in X, then what would be the current that goes through the 28V battery

## Homework Equations

**V = I*R**

## The Attempt at a Solution

a)

i used the first kirchhof law and i found that

**I3 = I2 - I1 = 6 - 4 = 2A**

b)i used the second law of kirchhof and found that

**Emf - 18 - 24 = 0 => Emf = 42 V**

c)again i used the second law and found that

**28 - 42 + 24 - I3*R = 0 => R = 5 Ω**

d) i don't know how to do it, please help

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