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Himanshu posted an Question

July 23, 2020 • 06:53 am

30 points

IIT JAM
Physics (PH)

Magnatism.

In the given fig how we can determine the direction of magnetic field as they both are flowing in opposite direction. Which law we can use ????

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Chandra prakash

direction of magnetic field is determined by right hand thumb rule.curl your fingers in the direction of current,your thumb will give direction of the magnetic field. Now in the above question,in larger circle current is moving in clockwise direction.so curl your fingers in clockwise direction.your thumb will point inside the plane of the paper.Hence direction of magnetic field is inside the plane.Now in smaller circle,current is moving in anti clockwise direction,So curl your fingers in anticlockwise direction.your thumb will point outwards the plane.hence direction of magnetic field in this case is outwards the plane.
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see attached file
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see attached file
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see
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but why direction will not be downwards????
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dear it's depend on current... either clockwise or anticlockwise...
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Ruby negi

direction of m.f is determined by right hand thumb rule.in my attached page, u see a current wire so take a current wire in right hand so that the thumb shows the direction of current then the curl fingers show the direction of m.f ... here in your question, the current is in the wire loop so curl your fingers of right hand in the direction of current then the thumb shows the direction of m.f... in the larger loop, current is in clockwise direction so when u curl your finger like this, u will get the direction of m.f that is inside the plane of paper. now for small loop, current is in anticlockwise direction so M.f is out of the plane of paper.. the conclusion is u have to use right hand for finding the direction of m.f ....
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for any doubt u could ask...
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best regards...
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i used and i got direction of both coils but why the ultimate direction is upward why not downwards?????
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Because of magnitude is max in upward direction then downward direction, u can take a analogy as if u two vectots (let 5(-i cap) and 3(i cap) ) ,u can see both vectors have different direction but for final direction u subtract both vectors and get finally direction , so here also , magnitude of m.f due to smaller coil is greater than large coli . hope u get... for further doubt, must ask...
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Dhairya sharma Best Answer

use right hand thumb rule
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this will help u
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ok i use and i got direction of both coils but why the ultimate direction is upward why not downwards?????
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Ravi prakash yadav

direction of magnetic field is determined by right hand thumb rule.curl your fingers in the direction of current,your thumb will give direction of the magnetic field. Now in the above question,in larger circle current is moving in clockwise direction.so curl your fingers in clockwise direction.your thumb will point inside the plane of the paper.Hence direction of magnetic field is inside the plane.Now in smaller circle,current is moving in anti clockwise direction,So curl your fingers in anticlockwise direction.your thumb will point outwards the plane.hence direction of magnetic field in this case is outwards the plane.
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but why the direction cannot be downwards????
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