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The given figure shows an electric circu...

The given figure shows an electric circuit in which a lamp L is connected. What happens to the brightness of the lamp L when the switch S is closed? (Box represents extra resistance in the circuit.)

A

It becomes dimmer.

B

It becomes brighter.

C

It goes off.

D

It remains the same

Text Solution

Verified by Experts

The correct Answer is:
B
When switch is open, the resistance box decreases the amount of current flowing in the circuit. Hence the brightness of the bulb is low. But when switch is closed, the current is provided by the another path to flow with negligible resistance. So current increases in the circuit. Hence brightness of the bulb will increase.
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Knowledge Check

  • A, B in the figure are identical lamps. What changes occur in the brightness of the lamps when its switch S in closed?

    A
    Brightness of A increases but that of B decreases
    B
    Brightness of A remains the same but that of B decreases
    C
    Brighness of both A and B decreases
    D
    Brightness of A increases but that of B remains the same

  • In the circuit shown above, when then switch S is closed,

    A
    no charge flows through S
    B
    charge flows from A to B
    C
    charge flows from B to A
    D
    charge flows initially from A to B and later from B to A

  • If X, Y and Z in figure are identical lamps, which of the following changes to the brightness of the lamps occur when switch S is closed?

    A
    `X` stays the same, `Y` decreases
    B
    `X` increases ,`Y` decreases
    C
    `X` increases,`Y` stays the same
    D
    `X` decreases,`Y` increases

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