Can there be an induced emf in a circuit at an instant?

The greater the speed, the greater the magnitude of the emf, and the emf is zero when there is no motion, as shown in (e). Faraday also discovered that a similar effect can be produced using two circuits—a changing current in one circuit induces a current in a second, nearby circuit.

How is emf induced in inductor?

An inductor typically consists of an insulated wire wound into a coil. When the current flowing through the coil changes, the time-varying magnetic field induces an electromotive force (e.m.f.) (voltage) in the conductor, described by Faraday’s law of induction.

Is emf induced in an open circuit?

In a closed circuit, electric currents are induced so as to oppose the changing magnetic flux. It is as per the law of conservation of energy However, in case of an open circuit, an emf is induced across its ends.

Does induced emf always act to decrease magnetic flux?

5 Does the induced emf always act to decrease the magnetic flux through a circuit? Ans. No. If magnetic flux in a circuit increases then emf acts to decrease the magnetic flux.

Does inductor keep flux constant?

Reason :- An inductor tends to keep the flux (i.e. current) constant.

Can a current be induced in an open circuit?

In a closed circuit, electric current is induced so as to oppose the changing magnetic flux as per conservation of energy. However, in open circuit, emf is induced across its ends.

Is emf present in closed circuit?

Hint: The electromotive force (emf) is a force that drives an electron in the circuit, however the potential difference in a circuit is caused due to a battery, and so there is some work inside the battery. …

What happens when EMF is induced in an inductor?

If there is a conductor there, the EMF is induced in the conductor. An inductor is a conductor. IF there is a path (complete circuit) then a current will flow. The amount of current depends on the EMF and resistance of the path (Ohm’s Law). If there is no path, no current will flow.

Does an inductor produce current when a magnetic field changes?

Yes. To be 100\% correct, a changing magnetic field induces an EMF . If there is a conductor there, the EMF is induced in the conductor. An inductor is a conductor. IF there is a path (complete circuit) then a current will flow. The amount of current depends on the EMF and resistance of the path (Ohm’s Law).

Why is there no EMF around the loop in this circuit?

Since the net flux is not changing, there is no emf around the loop enclosing the surface. Nonetheless, since the resistance is zero, the current is independent of the emf and so one cannot conclude that the current is zero or unchanging. In usual conductors, the Ohm’s law j = σ E ensures that such work will be dissipated.

What happens when there is no path in an inductor?

If there is no path, no current will flow. This changing magnetic field can come from an external magnet/field, or it can come from the inductor itself. A current that is changing in this inductor, induces the EMF in itself. If this current is passing rhrought zero as it is changing. For that instant, there is an induced EMF ar zero current.