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EAMCET Engineering 2005 Solved Paper
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© examsnet.com
Question : 32
Total: 160
In a meter bridge a
30
Ω
resistance is connected in the left gap and a pair of resistances
P
and
Q
in the right gap. Measured from the left, the balance point is
37.5
cm
, when
P
and
Q
are in series and
71.4
cm
they are in parallel. The values of
P
and
Q
(in
Ω
) are
4010
3515
3020
2525
Validate
Solution:
I st case
30
P
+
Q
=
l
(
100
−
l
)
30
P
+
Q
=
37.5
(
100
−
37.5
)
30
P
+
Q
=
37.5
62.5
P
+
Q
=
30
×
62.5
37.5
P
+
Q
=
50
. . . (i)
II nd case
30
P
Q
=
l
(
100
−
l
)
30
(
P
+
Q
)
P
+
Q
=
71.4
(
100
−
71.4
)
30
×
50
P
Q
=
71.4
28.6
P
Q
=
30
×
50
×
28.6
71.4
P
Q
≈
600
. . . (ii)
So, from Eqs. (i) and (ii), we get
P
=
30
Ω
,
Q
=
20
Ω
© examsnet.com
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