# Thought Of the Day_3_EMI&MagneticField!!

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Note by Rohit Gupta
6 years, 2 months ago

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Yes, an induced electric field can exist at a point which has zero magnetic field. If there is a time varying magnetic field, it produces an induced electric field, a magnetic field can vary with time and also simultaneously have its magnitude zero at an instant.

- 6 years, 2 months ago

I think that induced electric field can exist at a point where there is no magnetic field at all. Am I right ? @Rohit Gupta sir

- 6 years, 2 months ago

Yes You right Sandeep Bhardwaj, If there is a variable magnetic field confined to a specific region then the induced electric field produced can go beyond that region as well..!!

- 6 years, 2 months ago

Yes electric field does exist at a point where magnetic field is not present, but the toughness lies in finding the magnitude and direction of electric field. For that we have solve super hard differential equations unless we have circular symmetry of magnetic field.

- 6 years, 2 months ago

Probably yes..

- 6 years, 2 months ago

- 6 years, 2 months ago

yes

- 6 years, 2 months ago

Let's change the question into another way round.

When two electrons are traveling parallel in space, it was concluded that attraction force due to (mutual?) magnetic induction shall never be greater than repelling force due to electrostatic force.

Unless drifting inside an electrical conductor with many protons around to make the wire to attract each other, two electrons alone cannot attract each other, otherwise they shall eventually collide.

Now, talking about an absolute speed, if only the electrons know that they are in motion, then they tend to get closer to each other. Note that this has nothing to do with direction of motion but perpendicular direction to motion only.

When we spin a pail of water, a parabolic shape formed by a force challenging the gravity. This shows that the pail of water knows what had happened around it.

Don't you think that the electrons suppose to know what happened to themselves in this way as well?

- 5 years, 9 months ago

if the magnetic field at any point is varying, even with the magnetic field zero at an instant, EMF is induced and if the circuit is closed electric current is also induced. the magnetic field just needs to vary with time.

- 6 years, 2 months ago

Exactly its not about the magnitude of magnetic field its about the magnitude of rate of change of magnetic field...

- 6 years, 2 months ago

Ansh we can generalize this further , even if there is a region of time varying magnetic field 2 km from us then also we will experience induced electric field.

- 6 years, 2 months ago

Yes

- 6 years, 1 month ago

yes.... because magnetic field produced by moving charge... not in static charge.... in induced current there is static charge.... but when we move that charge then we experience magnetic field

- 5 years, 7 months ago