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Question

Electric current is passed through a straight conductor passing through the centre of a piece of cupboard. Some iron filings are sprinkled on the cardboard and tapped. How will the iron filings spread out around the conductor ?

A
settle as parallel lines
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B
settle as circles
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C
settle at one point
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D
do not acquire any regular pattern
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Solution

The correct option is C settle as circles
The iron filings around the conductor settle as circles indicating the field lines of a magnetic field around a straight current carrying conductor.
236246_206531_ans_808c395b674f46a6b15a4a9b3cc9c2f3.png

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