NEET2019Physics-Current Electricity
NEET 2019 Physics Electric Circuits MCQ Question
Type: MCQ-conceptual-Hard-Class 12
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:
A
1 : 2
B
2 : 1
C
4 : 9
D
9 : 4
Correct Answer
Option D
Detailed Explanation
In the first case, all bulbs are in parallel, so the power is proportional to the number of bulbs. In the second case, only three bulbs are glowing, so the power is proportional to 3. The ratio is 6:3 = 2:1, but considering the arrangement, the effective resistance changes, giving a power ratio of 4:9.
Found an issue with this question?