How do i find the magnetic field at the centre of two loops?

I found the value of B for each loop and so do i have to add them together or subtract the inner loop from the outer loop in order to find the value of B at the centre?





NOTE about the diagram: the current in the inner loop is meant to be clockwise as well, i just couldnt find a diagram of it. So since the current flows in the same direction for both loops i thought you just had to add the two values of B. Is this correct? And if not why?





http://people.physics.tamu.edu/asvid/e2_...

How do i find the magnetic field at the centre of two loops?
since u know the formula for magnetic field at the centre of a current carrying coil, all u need to know is fleming%26#039;s right hand rule to find the direction of magnetic field : cl ose ur right fist with the thumb pointed outwards. now direct the thumb along the direction of the current.. the direction in which the rest of ur fingers are curled gives the direction of magnetic field. (but take care to not use ur left hand, which all of us often tend to do)..


from this rule, v see that magnetic fields due to the 2 loops at their common centre is in the same direction. so v add them up. in case they were in opposite directtions, v would have found out their difference. in general, v need to vectorially add the magnetic fields always.


in this case, u add them up.



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