Question

mia finds that when she places a needle near a magnet, the needle rotates to point toward the magnets south pole. mia claims that this provides evidence of a magnetic field that affects both objects. explain why the needle rotated when mia placed it near the magnet.

Explanation:

A magnet has a magnetic field around it. When a magnetic object (like the needle) is placed in this field, it experiences a force. Opposite poles attract. The needle is a magnetized object (or can be magnetized by the magnet's field). So, the needle rotates to align with the magnetic field lines. The south pole of the magnet attracts the opposite pole (north pole) of the needle (or magnetizes the needle so that the induced opposite pole is attracted), causing the rotation. This shows the magnetic field affects the needle (a magnetic object) and the magnet (since the field is from the magnet).

Answer:

The needle rotates because the magnet has a magnetic field. Magnetic fields exert forces on magnetic materials. The needle, being a magnetic material (or becoming magnetized by the magnet's field), experiences a torque. Opposite magnetic poles (created either in the pre - magnetized needle or induced in a non - magnetized but magnetic material needle) attract. So, the needle rotates to align with the magnetic field of the magnet. This demonstrates the magnetic field (which is a property of the magnet) acts on the needle (a magnetic object), and since the field comes from the magnet, it affects both (the magnet creates the field, the field acts on the needle).