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###### Vidushi Saklani posted an Question
September 20, 2021 • 22:26 pm 30 points
• IIT JAM
• Physics (PH)

# Why is magnetic field negative in both the cases because it is coming outwards at z=0?

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• ##### Vidushi saklani

could you plz tell how to find the resultant

Now try to understand that Resultant B is in -x and -y direction and from there you can make an angle with -x axis and x axis

• ##### Anshum Sharma

It is Negative Acc. to Right hand thumb rule which says that current is in the thumb direction and curl of the fingers are the Magnetic field. so Apply here, At z = -a, when the current is in +x direction then curl of the fingers are towrds the - y direction and similarly at z = a when current is in +y direction then the curl of the fingers are towrds - x direction .

• ##### Vidushi saklani

i have resolved them ..but im not able to find the resultant ? and also negative sign in magnetic field ?

see my answer then tell me if you feel doubt

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