The N pole of a bar magnet is brought close to end X of an unmagnetised iron bar as shown. Which diagram correctly shows the induced poles on the iron bar?
Question 1 Report
The N pole of a bar magnet is brought close to end X of an unmagnetised iron bar as shown. Which diagram correctly shows the induced poles on the iron bar?
Answer Details
This question tests magnetic induction. When a magnet is brought near an unmagnetised magnetic material, the material becomes temporarily magnetised by induction. The end nearest the magnet acquires the opposite polarity to the magnet's approaching pole.
The N pole approaches end X. By induction, X becomes a S pole (opposite to the approaching N), and Y becomes a N pole. This is why the iron bar is attracted to the magnet: the induced S pole at X is attracted to the N pole of the magnet.
If X became N (same as the approaching pole), the bar would be repelled, which contradicts the observation that unmagnetised iron is always attracted to a magnet.
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