NEET Physics Bar Magnet MCQ Question
Consider a bar magnet placed in a horizontal plane with its axis aligned along the magnetic north-south direction. Null points are found on the axis of the magnet at 14 cm from the center. If the magnet is rotated 180°, where will the new null points be located?
Closer than 14 cm from the center
Farther than 14 cm from the center
Exactly at 14 cm from the center
Null points will disappear
Correct Answer
Detailed Explanation
When the bar magnet is rotated 180°, the null points will be farther than 14 cm because the magnetic field direction is reversed, causing the interference with Earth's field to occur at a different location.
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