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QNEET-2019-Ph-826: NEET 2019 Physics - Class 12 NEET-2019-Ph-826 Solution: Six similar bulbs are connected as shown in the figure with a…
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: 4:9 9:4 1:2 2:1
Multiple Choice Options
- A 4:09
- B 9:04
- C 1:02
- D 2:01
Step-by-Step Verified Solution
(i) When all bulbs are
glowing, from the given figure.
Equivalent resistance, R eq = R 3 + R 3 = 2 R 3
Initial Power, (P i ) = 3 E 2 2 R ......(1)
(ii) When two section A and one from section B are
glowing.
R eq = R 2 + R = 3 R 2
Final Power, (P f ) = 2 E 2 3 R
_ P i P f = 3 E 2 2 R _ 3 R 2 E 2 = 9 : 4