generator produce and ac current?

Question

how generator can produce an ac current when motor inside generator cutting the magnetic field around it

Answer 1

When the generator winding pass through the magnetised pole, the winding produce electricity.Because the distance between magnetised pole and winding is always changing from far to near and near to far due to the rotation, the generated voltage is always chnaging. Basically all generator produce AC power.DC generator has commutator and carbon brush to convert from AC to DC.
Hope this will help.

Answer 2

What is an AC capacitor generator? It might be an LRC circuit. Start with a charged capacitor (C). The charge on the plates wants to recombine. Rig things so that in order to do so, it has to travel through an inductor (L). When it passes through the inductor, it creates a magnetic field, and as it starts to peter out, the collapsing magnetic field tends draws more charge from the (neutral) capacitor plate, therefore charging it up the opposite way. At some point, the magnetic field has totally collapsed, the capacitor is charged up as much as it will be in the opposite sense, and the process then goes back the other way. The motion eventually damps out (this is what the R does), but until it does you have an alternating current. The differential equation for such a circuit looks just like that for a swinging pendulum: the "over-withdrawal" effect is analogous to the tendency of the falling mass to keep going and swing up the opposite way. The inductor provides the current's "inertia."

Answer 3

when the magnetic is cutted ,it will generate EMF and that will be further amplified and used.