Circulating current when no load is connected to alternators

Q.  Two identical alternators having impedances Z1 and Z2 are connected in parallel produces E1 and E2 as their induced emf’s. if no load is connected to the alternators then a circulating current will flow in the circuit. This current is given by
- Published on 29 Oct 15

a. E1 + E2 / Z1 - Z2
b. E1 - E2 / Z1 + Z2
c. E2 - E1 / Z1 + Z2
d. E1 + E2 / Z1 + Z2

ANSWER: E1 - E2 / Z1 + Z2

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