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Air cored choke coil and delectric bulb are connected in series with A.C. mains. A soft iron rod is inserted in coil then the intensity of electric bulb will be :

Air cored choke coil and delectric bulb are connected in series with A.C. mains. A soft iron rod is inserted in coil then the intensity of electric bulb will be : Correct Answer increase

CONCEPT:

  • An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.
  • The magnetic field disappears when the current is turned off.

EXPLANATION:

  • When a soft iron core is inserted inside the coil then the strength of the magnetic field becomes very large because the iron core gets magnetized by induction.
  • The soft iron core helps in concentrating the magnetic lines of forces through the coil so that the magnetic field is almost uniform at the end face of the core.
  • Hence, the strength of the magnetic field increases when a soft iron core is inserted inside a coil and thus the intensity of the electric bulb will be increased. Therefore, option 2 is correct.

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  • The strength of an electromagnet can be increased by increasing the number of turns of wire around the iron core and by increasing the current or voltage.

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