A Loop ABCD have current i = 10A as shown in figure. AB & CD are arc of radius 3cm & 5cm Respectively determine magnetic field intensity at O.
Radius of arc
QR = 3 cm = r1
PS = 5 cm = r2
Magnetic field due to an arc =
So,
Magnetic field at O
= (Since current is in opposite direction )
=
=
=
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