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Why does a compass needle get deflected ...

Why does a compass needle get deflected when brought near a bar magnet?

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The needle of a compass is a small magnet. That’s why when a compass needle is brought near a bar magnet, its magnetic field lines interact with that of the bar magnet. Hence, a compass needle gets deflected.
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Why does a magnetic compass needle pointing North and South in the absence of a nearby magnet get deflected when a bar magnet or a current-carrying loop is brought near it. Describe some silent features of magnetic lines of field concept.

Knowledge Check

  • When a magnetic compass needle is carried nearby to a straight wire carrying current, then I. the straight wire cause a noticeable deflection in the compass needle. II. the alignment of the needle is tangential to an imaginary circle with straight wire as its centre and has a plane perpendicular to the wire

    A
    (I) is correct
    B
    (II) is correct
    C
    both (I) and (II) are correct
    D
    neither (I) nor (II) is correct

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