??????????, ?? ????????? ???????????
????-?????? ????
(Biot?Savart law)
????????????????
?? ???????? ??
??????
?? ?? ???? ??????????? ?????? ???? ???????? ???????? ???????? ???????
B
?? ??? ??????? ???? ????
B
?????? ??????, ????, ?????, ??? ?????????? ?????? ?????? ?????? ?? ???? ????????????? ???????? ??? ??? ? ? ?????? ???????
B
?? ???
????????? ????
???
?????? ????
??? ??????? ???????? ??????????? ??? ???????? ?? ???? ?? ?????? ?????????? ?????? ?????
?? ?????? ????? ????? ??????? ???? ( ??????????? ???? ????) ?????? ??????? ???????? ????????? ???? ????? ??? ?????
???? ????? ????? ??? ????? ??????-
????
- B
???????? ????????? ???
- I
??????? ????
?? ??????
- d
l
is a vector, whose magnitude is the length of the
differential
element of the wire, and whose direction is the direction of
conventional current
,
- μ
?
is the
magnetic constant
,
- is the displacement
unit vector
in the direction pointing from the wire element towards the point at which the field is being computed, and
- is the full
displacement vector
from the wire element to the point at which the field is being computed.
???? ?????????? ?????? ??????
???? ???????
??????? ????????