All magnets have north and south poles. Opposite poles are attracted to each other, while the same poles repel each other. When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction. The force generated by the aligned atoms creates a magnetic field.
Answer: Photoelectric effect
Explanation:
The pressure exerted is 
Explanation:
The pressure exerted by a force on a surface is given by

where
p is the pressure
F is the magnitude of the force
A is the area of the surface
In this problem, we have:
F = 200 N is the force exerted (the weight of the ant)
is the area
Therefore, the pressure exerted is:

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