Suspend the bar magnet freely using a string. The magnet will align itself with the Earth’s magnetic field. The end pointing towards the Earth’s geographic north is the magnet’s north pole, as opposites attract.
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To find the poles, bring the marked magnet close to the unmarked one. The north pole of the marked magnet will attract the south pole and repel the north pole of the unmarked magnet, revealing its poles.
Reshma can identify the magnets by bringing each bar close to the other two. If a bar repels one and attracts the other, it is a magnet. The iron bar will only be attracted.
Magnets in electric motors create a magnetic field that interacts with the current-carrying coil, producing rotational motion. This interaction between the magnetic field and electric current is fundamental to the motor’s operation.
The Earth’s magnetic field is a natural magnetic field generated by the movement of molten iron in the Earth’s outer core. It protects us from solar radiation and aids in navigation using compasses.