Physics
Copper wire is wound around a steel bar FT. Current is allowed to pass through the coil for some time and then the bar is removed.
(a) Draw only the magnetised bar FT and mark its poles.
(b) Trace two magnetic lines of force around FT clearly indicating the direction.
Electro-Magnetism
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Answer
(a) Since, looking from the F side current is flowing in anti-clockwise direction and hence, north pole developed at that end and south pole at the T end.
The labelled diagram is given below :
(b)
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