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i
1
R
1
=
i
2
R
s
. The second equation gives
i
2
=
i
1
R
1
/
R
s
, which is substituted into the first
equation to obtain
()
2
1
12
1
1
1
.
s
xs
x
s
R R
R
RR
i RR i
R
R
R
+=
+
⇒
=
55. Let
i
1
be the current in
R
1
and
R
2
, and take it to be positive if it is toward point
a
in
R
1
.
Let
i
2
be the current in
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 Spring '08
 Any
 Physics, Current

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