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so far i tried doing:

V = IR

hence 2.4/6 = 0.4 A

V = Ir

2.6/0.4 = 6.5 V

substituting the above into:

V = E - Ir

2.6 = E - (0.4 x 6.5)

E = 2.6 + (0.4 x 6.5)

therefore E = 5.2 V

but something seems very wrong here..

any help would be much appreciated =)