Correct option is C
The correct answer is option (c) number of field lines intersect at a given point inside a magnetic field.
Repulsion is a sure test of magnetism:
- Correct. Repulsion confirms that an object is magnetized, as non-magnetic materials can sometimes be attracted due to induced magnetism.
Outside a bar magnet, the magnetic field lines are directed from north to south pole.
- Correct. Magnetic field lines outside a bar magnet always emerge from the north pole and terminate at the south pole.
A number of field lines intersect at a given point inside a magnetic field.
- Incorrect. Magnetic field lines never intersect. If they did, it would imply that the magnetic field has two different directions at the point of intersection, which is impossible.
A freely suspended bar magnet points in north–south direction.
- Correct. This property of a bar magnet is due to Earth's magnetic field, which aligns the magnet's north pole toward the Earth's magnetic south pole (geographic north).
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