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Manipal Entrance Test 2019 Physics Paper
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© examsnet.com
Question : 39
Total: 50
Consider four circuits shown in the figure below. In which circuit power dissipated is greatest?
(Neglect the internal resistance of the power supply)
Validate
Solution:
Let each resistance is R
P
=
E
2
R
eq
In choice (a)
R
eq
=
R
×
R
R
+
R
=
R
2
⇒
P
1
=
E
2
R
2
=
2
E
2
R
In choice (b)
R
eq
=
R
+
R
=
2
R
P
2
=
E
2
2
R
=
0.5
E
2
R
In choice (c)
R
eq
=
R
2
+
R
=
3
R
2
P
3
=
2
E
2
3
R
=
0.6
E
2
R
In choice (d)
R
eq
=
2
R
×
R
2
R
+
R
=
2
R
3
P
4
=
3
E
3
2
R
=
1.5
E
2
R
So,
P
1
is maximum.
© examsnet.com
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