Lecture 16
Lecture 16

1
Ampere’s Law
in Magnetostatics
The path integral of the dot product of magnetic field and unit
vector along a closed loop,
Amperian loop
, is proportional to
the
net
current encircled by the loop,
0
t
C
C
C
B dl
B dl
I
μ
=
=
∫
∫
ur
r
±
±
±
•
Choosing a direction of
integration.
•
A current is
positive
if it
flows along the
RHR normal
direction of the Amperian
loop, as defined by the
direction of integration.
BiotSavart’s Law
can be used to derive another relation:
Ampere’s Law
0
1
2
(
)
i
i
μ
−
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