How many times per second does the electric current change its direction, induced in a closed loop of wire

How many times per second does the electric current change its direction, induced in a closed loop of wire, rotating between two poles N and S at a speed of 3000 rpm.

One minute 60 seconds. We find how many revolutions the electric current makes in one second: 3000 rpm ÷ 60 = 50 rpm. In one full turn, the electric current changes its direction twice (1 turn = 2 half turns). Therefore, 50 rps x 2 = 100 half-revolutions. Conclusion: the electric current changes its direction 100 times per second.