Current i=2.5A flows along the circle x2+y2=9cm2(here x and y are in cm).Magnetic field at point (0,0,4cm) is??I think we have to use the formula for magnetic field along the axis of a circular ring.But answer is coming out to be (9/25)(pie)(10-7) but answer is given something else.Plzz tell me where i am wrong.(Maybe a calc. error,plz chk that too:))

Radhika Batra , 10 Years ago

Grade 11