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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 ( E1=5V and E2=4V ) and three resistors (R1 = 3ohm, R2 = 3ohm, R3=4ohm) as shown.

a . What is the current I 3 flowing through the batteries ?

b . What is the voltage Vb-Va between the points a and b in the circuit ?