Table of Contents
- 1 Why is induced emf maximum when coil is horizontal?
- 2 Why is the induced emf in a coil zero when its plane is normal to the magnetic field even though maximum magnetic flux is linked with the coil in this position?
- 3 Why an emf is induced in the coil as it rotates?
- 4 When the plane of the coil is kept parallel to the magnetic field then the emf induced is?
- 5 Why an EMF is induced in the coil as it rotates?
- 6 Can you generate emf without rotating the coil?
- 7 How do you calculate the magnitude of induced magnetic field?
- 8 How does the direction of induced EMF affect current?
Why is induced emf maximum when coil is horizontal?
When the coil is horizontal, the cutting or blocking of magnetic lines is minimum but the rate of change of fluxes is maximum which produces maximum emf.
Why the induced emf is at maximum when the coil is parallel to the magnetic field?
When the plane of the armature is parallel to the lines of force of magnetic field, the rate of change of magnetic flux linked with it is maximum. Therefore, the e.m.f. induced in the armature in this orientation is maximum.
Why is the induced emf in a coil zero when its plane is normal to the magnetic field even though maximum magnetic flux is linked with the coil in this position?
By Faraday’s law, the magnitude of the induced emf is equal to the rate of change of magnetic flux, so its maximum values occurs when the flux curve has its greatest slope. The induced emf goes through zero when the flux curve has zero slope.
What is the emf induced in single loop generator when the coil is perpendicular to field axis?
EMF is proportional to the rate of change of magnetic field lines that go through the coil. When the plane of the coil is perpendicular it has lots of magnetic field lines passing through it. The maximum EMF will be induced when the coil is perpendicular to the field. EMF is Zero when the coil is parallel to the field.
Why an emf is induced in the coil as it rotates?
Hint: Induced emf is generated in a rotating coil when the angle between area vector and magnetic field changes continuously, hence changing the amount of magnetic flux through the coil. EMF or electromotive force is said to be induced when the flux linking with a conductor or coil changes.
Why is induced emf negative?
The negative sign in Faraday’s law comes from the fact that the emf induced in the coil acts to oppose any change in the magnetic flux. This is summarized in Lenz’s law. Lenz’s law: The induced emf generates a current that sets up a magnetic field which acts to oppose the change in magnetic flux.
When the plane of the coil is kept parallel to the magnetic field then the emf induced is?
When the rectangular coil is parallel to the direction of the magnetic field, the induced current is zero.
Why EMF is induced in the coil?
An emf is induced in the coil when a bar magnet is pushed in and out of it. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf, and there is no emf when the magnet is stationary relative to the coil.
Why an EMF is induced in the coil as it rotates?
Why emf is induced in the coil?
Can you generate emf without rotating the coil?
a) State the principle of ac generator. b) Explain with the help of a well labelled diagram, – Sarthaks eConnect | Largest Online Education Community.
How do you change the induced emf of a coil?
By rotating the coil relative to the magnet. By moving the coil into or out of the magnetic field. By changing the area of a coil placed in the magnetic field. By moving a magnet towards or away from the coil. The induced emf in a coil is equal to the rate of change of flux linkage.
How do you calculate the magnitude of induced magnetic field?
The induced current produces a magnetic field, which opposes the change in the magnetic flux. The magnitude of the induced emf can be calculated using Faraday’s law. The magnetic field inside the long coil is B = μ 0 (N/ℓ)I. The flux through the coil is NBA = μ 0 (N 2 /ℓ)IA.
When does a coil experience an induced current when magnetic field varies?
A coil experiences an induced current when the magnetic field passing through it varies. (a) When the magnet moves toward the coil the current is in one direction. (b) No current is induced while the magnet is held still.
How does the direction of induced EMF affect current?
The direction of the induced EMF will control the direction of the induced current. The direction of the induced EMF follows from Lenz’s Law. Lenz’s Law. The current that is induced in a coil (due to a magnetic flux change through the coil) will always be such that it opposes the change that caused it.