Q.

In the circuit diagram, all the bulbs are identical. Which bulb will be the brightest?

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a

A

b

B

c

C

d

D

answer is C.

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Detailed Solution

As all bulbs are identical and the power (related to brightness) is given as P = I2 R, so the resistor with the most current will be brightest. As bulb C has the same current as that through the battery while the branches with bulbs A, B and D are in parallel and have the total current split between the branches, the current through bulb C is greatest.
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