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maxmax1
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Homework Statement
Determine the B field at a point P with distance d from centre of current ring radius r (d>r ie outside ring of current) but IN the Plane of ring (i.e off the axis)
Homework Equations
Biot savart: db=(u.I/4pi.r^2).dl.sinx
u=mu, I=current, x=angle made with current vector element dl and vector r connecting P to dl.
The Attempt at a Solution
the angle x will vary at all points along ring with vector joining point P, as will r.
I will integrate from 0 to 2pi my expression for db but with r^2=a^2+d^2-2adcosy
where y is angle between radial vector and d.
I am stuck because cannot determine how to express y in terms of x. and thus cannot integrate!
many thanks!