Vanshika posted an Question
April 21, 2020 • 01:43 am 30 points
  • IIT JAM
  • Physics (PH)

Why is the electric field outside long infinite tightly wound solenoid zero?

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    Shanu arora best-answer

    electric field outside a solenoid is zero only when there is steady / constant current is flowing in the wires ,which In turn makes B zero for outside and thus using Maxwell's equation , E is zero .But is there current varies with time t then the magnetic field as well electric field is non zero and have the form as in following attachment

    cropped1826558665.jpg
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    yes the current is steady in the wire, but how did we get this formula ?

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    actually for this you need to go through Griffiths , somewhere in induction chapter ( may be problems ,I don't remember exactly) but here are my notes ,might help

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    I have posted notes ,have a look.

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    ok, but where have you posted notes? I can't see here in comments.

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