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CBSE - XII Science - Physics

to derive the magnetic field inside a current carrying solenoid, when we imagine a loop to be taken say pqrs we let its one side to be out of the magnetic field, why?( if we do take it as such answer would be different ) 

Asked by alice 7th September 2015, 1:59 PM
Answered by Expert


Hi Alice, 

This is done because we use Ampere's law to derive the magnetic field.

Now, according to Ampere's law, the magnetic field due to a closed amperian loop is zero.

So, if the entire loop is placed inside, no current will flow through the loop and we will not be able to find B.

Hence, half of the loop is kept inside and half of it is outside.

Answered by Expert 7th September 2015, 6:13 PM

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