ELECTRICAL CIRCUITS
EEE
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
The magnetic paths ‘BE’ and ‘BCDE’ are in parallel and form a parallel magnetic circuit. The AT
required for this parallel circuit is equal to AT required for any one of the paths. Let S
1
=
reluctance of
path EFAB
Let,
S
1
= reluctance of path EFAB
S
2
= reluctance of
path BE
S
3
= reluctance of
path BCDE
Total MMF= MMF for path EFAB + MMF for path BE or path BCD
NI
=
Ф
1
S
1
+ Ф
2
S
2
= Ф
1
S
1
+ Ф
3
S
3
COMPOSITE MAGNETIC CIRCUIT:
Consider a magnetic circuit which consists of two specimens of iron arranged as shown in
figure. Let
ℓ
1
and
ℓ
2
be the mean lengths of specimen 1 and specimen2 in meters, A
1
and
A
2
be
their respective cross sectional areas in square meters, and
1
and
2
be their respective relative
permeability’s.
The reluctance of specimen 1 is given as
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