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NEET 2019 Physics and Chemistry
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© examsnet.com
Question : 48
Total: 90
Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance.
The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be :
[NEET 2019]
9 : 4
1 : 2
2 : 1
4 : 9
Validate
Solution:
👈: Video Solution
(i) All bulbs are glowing
R
e
q
=
R
3
+
R
3
=
2
R
3
Power
(
P
1
)
=
E
2
R
e
q
=
3
E
2
2
R
.
.
.
(1)
(ii) Two from section A and one from section B are glowing.
R
e
q
=
R
2
+
R
=
3
R
2
Power
(
P
f
)
=
2
E
2
3
R
.
.
.
(
2
)
P
i
P
f
=
3
E
2
3
R
2
R
2
E
2
=
9
:
4
© examsnet.com
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