Explain, step by step, how an electric bell rings continuously as long as its switch is pressed.

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TextElectromagnet and Its ApplicationsElectric Bell and Its Working

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Draw a labelled diagram to show the pattern of magnetic field lines produced due to a current carrying straight conductor. Mark on it the direction of current in the conductor and the direction of magnetic field lines.

TextMagnetic Field Due to Current-Carrying Straight ConductorElectromagnet and Its Applications

Name the device used to magnetise a piece of magnetic material. Draw a labelled diagram to show the arrangement used for the magnetisation of a cylinder made of soft iron.

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Magnetic Field Due to Current-Carrying Straight Conductor