How can you say that AC emf is induced in the coil?

An emf is induced in the coil when a bar magnet is pushed in and out of it. Emfs of opposite signs are produced by motion in opposite directions, and the emfs are also reversed by reversing poles.

At what position of the coil in an AC generator the induced emf is minimum?

The strength of this induced current depends upon magnetic flux. Magnetic flux is maximum when the plane of the coil is parallel to the magnetic field. Magnetic flux is minimum when the plane of the coil is perpendicular to the magnetic field.

Why is emf induced in an AC generator?

Working of an AC Generator When the armature rotates between the poles of the magnet upon an axis perpendicular to the magnetic field, the flux which links with the armature changes continuously. Due to this, an emf is induced in the armature.

What is AC generator give its diagram principle and working?

Principle: It works on the principle of Faraday’s law of electromagnetic induction. Whenever a coil is rotated in a uniform magnetic field about an axis perpendicular to the field, the magnetic flux linked with coil changes and an induced emf is set up across its ends.

At what angle between the pole of the magnet and armature coil does the induced voltage in this coil becomes maximum in a rotation?

Coil gets turned to reference position 90∘: The plane of the coil is parallel to the magnetic field lines. The sides of the coil are moving perpendicularly to the magnetic field lines and will be “cutting” through the magnetic field lines at the greatest rate. Hence, the induced e.m.f. is the maximum at this position.

How do you know the direction of AC generator?

The forefinger points in the direction of the magnetic field, and the thumb must point in the direction of the motion of the conductor, in the direction in which we are pushing the conductor. Then notice the middle finger points to the right. That means the current in this conductor will flow to the right.

What is the direction of induced emf?

The direction of induced emf is perpendicular to the direction of magnetic field as well as the direction of velocity of the charge. This direction can be determined by right-hand rule.