Why is no current induced when the coil is vertical?
At vertical position wire velocity (wire movement) is tangent to field lines, no lines are “cut””so no induced voltage.
Why is emf maximum in an AC generator when the coil is horizontal?
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.
When the magnitude of the induced current is maximum?
The induced current is achieves its maximum value again when the armature is at 270°. After rotating 360°, the armature returns to its original position. The current in the external circuit always flows in one direction.
What is the direction of the current induced in the coil?
The current induced in the coil creates another field, in the opposite direction of the bar magnet’s to oppose the increase. This is one aspect of Lenz’s law—induction opposes any change in flux.
Why does an AC generator produce an induced emf?
A.C GENERATOR. A Generator is a device which converts mechanical energy into electrical energy. In generator an induced emf is produced by rotating a coil in a magnetic field. The flux linking the coil changes continuously hence a continuous fluctuating emf is obtained.
Why is an emf induced in an AC generator?
When the coil of a motor is turned, magnetic flux changes through the coil, and an emf (consistent with Faraday’s law) is induced. The motor thus acts as a generator whenever its coil rotates.
How does the number of turns in a coil relate to the magnitude of the maximum induced voltage?
Increasing the number of turns of wire in the coil – By increasing the amount of individual conductors cutting through the magnetic field, the amount of induced emf produced will be the sum of all the individual loops of the coil, so if there are 20 turns in the coil there will be 20 times more induced emf than in one …
Why does the coil rotate when there is a current in the coil?
The coil of wire is mounted in the gap between the two magnets. The split rings make electrical contact with the coil and reverse the current every half turn. When an electric current flows through the coil, a force is exerted on the coil, causing it to spin.