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A student fixes a sheet of white paper o...

A student fixes a sheet of white paper on a drawing board using some adhesive materials. She places a bar magnet in the centre of it and sprinkles some iron filings uniformly around the bar magnet using a salt-sprinkler. On tapping the board gently, she observes that the iron filings have arranged themselves in a particular pattern.
Draw a diagram to show this pattern of iron filings.

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A student fixes a sheet of white paper on a drawing board. He places a bar magnet in the centre of it. He sprinkles some iron filings uniformly around the bar magnet. Then he taps the board gently and observes that the iron filings arrange themselves in a particular pattern. (a) Why do iron filings arrange in a pattern? (b) What does the crowding of iron filings at the end of the magnet indicate ? (c) What does the lines, along which the iron filings align, represent? (d) Draw a neat diagram to show the magnetic field lines around a bar magnet. (e) Write any two properties of magnetic field lines.

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Knowledge Check

  • A student fixes a sheet of white paper on a drawing board. He places a bar magnet in the centre of it. He sprinkles some iron filings uniformly around the bar magnet. Then he taps the board gently and observes that the iron filings arrange themselves in particular pattern. Why do the iron fillings arrange themselves in a particular pattern ?

    A
    Due to external force applied on the magnet.
    B
    Due to force exerted by the magnet outside the magnetic field.
    C
    Due to the force exerted by magnet within its magnetic field.
    D
    Due to pressure of magnetic field.

  • A student fixes a sheet of white paper on a drawing board. He places a bar magnet in the centre of it. He sprinkles some iron filings uniformly around the bar magnet. Then he taps the board gently and observes that the iron filings arrange themselves in particular pattern. What does the crowding of iron filings at the end of the magnet indicate?

    A
    Magnetic field is strongest near the poles of the magnet.
    B
    Magnetic field is weakest near the poles of the magnet.
    C
    There is no significant magnetic field at the poles of the magnet.
    D
    The significance of polarity

  • A student fixes a sheet of white paper on a drawing board. He places a bar magnet in the centre of it. He sprinkles some iron filings uniformly around the bar magnet. Then he taps the board gently and observes that the iron filings arrange themselves in particular pattern. What do the lines along which the iron fillings align represent?

    A
    North pole and south pole of the magnet
    B
    Strength of the magnet
    C
    Magnetic field lines
    D
    Gravitational force

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    While doing an experiment Neeraj fixed a sheet of white paper on a drawing board. He placed a bar magnet in the centre of it. He sprinkled some iron filings uniformly around the bar magnet. Then he tapped the board gently and observed that the iron filings arranged themselves in a particular pattern. Which of these is not a source of magnetic field?

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