Home
Class 10
PHYSICS
A battery E is connected to three identi...

A battery E is connected to three identical lamps P, Q and R as shown in figure:

Initially the switch S is kept open and the lamp P and Q are observed to glow with some brightness. Then switch S is closed. How will the brightness of glow of bulbs P and will change? Justify your answer.

Text Solution

Verified by Experts

The brightness of glow of bulb P will increase and brightness of glow of bulb will decrease. This is because on closing S, bulbs Q and R will be in parallel and the combination will be in series with bulb P. Hence the total resistance of the circuit will decrease and the current flowing in the circuit will increase. Therefore, the glow of bulb P will increase. Also since bulbs Q and R will be in parallel in this case, the current gets divided and lesser current flows through Q and hence the glow of bulb will decrease.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ELECTRICITY

    VK GLOBAL PUBLICATION|Exercise SOME IMPORTANT NUMERICALS |12 Videos

  • ELECTRICITY

    VK GLOBAL PUBLICATION|Exercise NUMERICALS (RESISTANCE AND RESISTIVITY)|23 Videos

  • LIGHT-REFLECTION AND REFRACTION

    VK GLOBAL PUBLICATION|Exercise PROFICIENCY EXERCISE (Long Answer Questions)|5 Videos

Similar Questions

Explore conceptually related problems

A circuit consists of three identical lamps connected to a battery as shown in figure. When the switch S is closed then the intensities of lamps A and B

A circuit consists of three identical lamps connected to a battery as shown in the figure. When the switch S is closed then the intensities of lamps A and B

Knowledge Check

  • Three identical bulbs P, Q and R are connected to a battery as shown in the figure. When the circuit is closed.

    A
    Q and R will be brighter than P
    B
    Q and R will be dimmer than P
    C
    all the bulbs will be equally bright
    D
    Q and R will not shine at all

  • 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

  • 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

    • Similar Questions

    Explore conceptually related problems

    Three identical bulb are connected as shown in figure . When switch S is closed, the power consumed in bulb B is P . What will be the power consumed by the same bulb when switch S is opened ?

    In the Figure shown, when the switch S is closed, one of the two bulbs glows momentarily. Which one?

    An electric bulb is connected in series with an inductor and an Ac source. When switch is closed. After sometime an iron rod is inserted into the interior of inductor. How will the brightness of bulb be affected? Justify your answer.

    Consider the situation shown in figure (31-E23 ) . The switch S is open for a long time and then closed . (a) Find the charge flown through the battery when the switch S is closed (b)Find the work done by the bettery .

    A, B, C are identical bulbs. How does the brightness of A and B change when the switch S is closed ?

    Home
    Profile