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The circuit shown has 3 identical light bulbs A, B, C and 2 identical batteries E1, E2 . When the switch is open, A and B glow with equal brightness. When the switch is closed: (A) A and B will maintain their brightness and C will be dimmer than A and B. (B) A and B will become dimmer and C will be brighter than A and B. (C) A and B will maintain their brightness and C will not glow. (D) A, B and C will be equally bright.

The circuit shown has 3 identical light bulbs A, B, C
and 2 identical batteries E1, E2 . When the switch is
open, A and B glow with equal brightness. When the
switch is closed:
(A) A and B will maintain their brightness and C will be
dimmer than A and B.
(B) A and B will become dimmer and C will be brighter
than A and B.
(C) A and B will maintain their brightness and C will not
glow.
(D) A, B and C will be equally bright.

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Grade:10

1 Answers

Vijay Mukati
askIITians Faculty 2590 Points
8 years ago
Option C. Replace the given the bulbs in the given circuit by resistance of equal values and try to solve the network. You will find that the current flowing though blub C comes out to be zero. Thanks.

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