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Physics Current Electricity Level: High School

The circuit in the figure which is shown at “click here” is composed of two batteries (V1=4V and V2 = 9V) and four resistors (R1 = 110 ohm, R2 = 40 ohm, R3 = 50 ohm, and R4 = 50 ohm ) as shown .

(a) What is the current which flows through R1 ?

(b) What is the current I 3 that flows through R3 ?