You have two batteries, one with E = 9.0 V and r = 0.8 and the

You have two batteries, one with E = 9.0 V and r = 0.8 Ω and the other with E = 3.0 V and r = 0.4 Ω.

(a) Show how you would connect the batteries to give the largest current through a resistor R. Find the current for

(b) R = 0.2 Ω,

(c) R = 0.6 Ω,

(d) R = 1.0 Ω, and

(e) R = 1.5 Ω.