7/21/2019 copyeq

1/1

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

= =