7/21/2019 copyeq
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Question:A current of ampere is flowing INA n equilateral triangle of side a. The magnetic induction
at the centroid will be
Answer: Distance of point Pfrom any wire
2 3
a
Magnetic field due to BC.
= = 2 !"
= +
" 2#sin sin $
%
iB
d
= +
" #sin!" sin!"$
%
iB
d
=
"3 2 3
%
iB
a
" 3
2
iB
a
=
&or all 3 wires'
" "3 3 (
2 2
i iB
a a
= =