Complete the paragraph.
(DCBA, `B_1` to `B_2`, right, left, ABCD, `B_2` to `B_1`)
In AC generator, according to Fleming's ________ hand rule, electric current is produced in the branches AB and CD. Thus, the current flows in the direction______________. In the external circuit, the circuit, the current flows from ____ through the galvanometer. If instead of one loop coil, a coil consisting of several turns is used, the current of magnitude several times flows. After half rotation, the branch AB takes the place of branch CD and the branch CD takes the position of the branch AB. Therefore, the induced current goes as _____