The correct option is (a) 1 only.
Explanation
Magnetic force is a fundamental non-contact force in physics. It arises from the interaction of magnetic fields generated by magnets or moving electric charges. This force acts over a distance without the need for physical contact between the interacting bodies.
Statement-wise Analysis
- Statement 1 is Correct: A magnet creates a magnetic field in the space surrounding it. When another magnet enters this field, it experiences a magnetic force (attraction or repulsion) without physical contact. Therefore, magnetic force is classified as a non-contact force (action-at-a-distance).
- Statement 2 is Incorrect: The force exerted by a magnet on a piece of iron (a ferromagnetic material) is also a magnetic force. Since magnetic force operates through a field, it does not require physical contact to act. Consequently, it is a non-contact force, not a contact force.
- Statement 3 is Incorrect: According to the fundamental laws of magnetism, like poles (North-North or South-South) repel each other, while unlike poles (North-South) attract each other.
Key Takeaway
Magnetic force is a non-contact force capable of acting over a distance. The fundamental rule of interaction is that like poles repel and unlike poles attract.