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A soft iron rod is inserted in the solen...

A soft iron rod is inserted in the solenoid. After this what will be the effect on the brightness of the bulb?

Text Solution

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The brightness will decreases, because L increases on inserting the iron rid and impedence `Z= sqrt(R^(2)+(omega L)^(2))` increases. This decreases the current, hence brightness decreases.
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Knowledge Check

  • Statement I: An eletric lamp is connected in series with a long solenoid of copper with air core and then connected to an ac source. If an iron rod is inserted in the solenoid, the lamp will become dim. Satement II: If an iron rod is inserted in the solenoid, the inductance of the solenoid increases.

    A
    Statement I is True, Statement II is True, Statement II is the correct explanation for Statement I.
    B
    Statement I is True, Statement II is True, Statement II is NOT the correct explanation for Statement I.
    C
    Statement I is True, Statement II is False.
    D
    Statement I is False, Statement II is True.

  • A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid :

    A
    will decrease
    B
    will increase
    C
    will become zero
    D
    will remain the same

  • Consider an ac circuit where an incandescent light bulb is in series with an inductor. If the frequency of generator is increased, what will happen to the brightness of bulb ?

    A
    The bulb will have same brightness
    B
    The bulb will shine brighten
    C
    The bulb will become dimmer
    D
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    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.

    A light bulb and an open coil inductor are connected to an ac source through a key as shown in Fig. The switch is closed and after sometime, an iron rod is inserted inot the interior of the inductor. The glow of the ligth bulb (a) increases (b) decreases (c) is unchanged as the iron is inserted. Give your answer with reasosns. What will be your answer if ac source is replaced by dc source ?

    In the above question, what will be the effect on the brightness of bulb if frequency of the source omega is increased?

    Assertion (A) : A bulb connected in series with a solenoid coil is connected to an a.c. source. The bulb glow becomes dimmer when a soft iron core is introduced in the solenoid coil. Reason (R) : On introducing soft iron core in the solenoid coil, its inductance increases.

    Assertion (A) : An electric lamp is connected in series with a long solenoid of copper with air core and then connected to AC source. If an iron rod is inserted in solenoid the lamp will become dim. Reason (R ) : If iron rod is inserted in solenoid, the induction of solenoid increases.

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