8
Rationalised 2023-24
115
Moving Charges and
Magnetism
Solution
 
0
2
d sin
|d
|
4
I
l
r
µ
θ
=
π
B
 [using Eq (4 11)]
2
d
10
m
l
x
−
= ∆
=
, I = 10 A,  r = 0 5 m = y, 
7
0
T m
/4
10
A
µ
−
π =
q = 90° ; sin q = 1
7
2
2
10
10
10
d
25
10
−
−
−
×
×
=
×
B
= 4 × 10–8 T
The direction of the field is in the +z-direction