Physics

Problem

Two batteries of EMF

E_{1} = 6\,\text{V}

and

E_{2} = 3\,\text{V}

with internal resistances

r_{1} = 1\,\Omega

and

r_{2} = 2\,\Omega

respectively are connected in parallel to an external resistor

R = 5\,\Omega

. Determine the current flowing through the external resistor

R