Henry sets his keys on a wooden table.
He then takes a powerful magnet and positions it...
![Physics](/tpl/images/cats/fizika.png)
Henry sets his keys on a wooden table.
He then takes a powerful magnet and positions it below the table and the keys. He finds that he is able to drag the keys along the table by moving the magnet. This demonstrates that
A.
magnetic forces act on wooden objects.
B.
magnetic forces act at a distance.
C.
gravitational forces are contact forces.
D.
gravity is proportional to mass.
![answer](/tpl/images/cats/otvet.png)
Answers: 3
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