A) Earths gravity pulls the box
B) Earths magnetic field attracts the spring
C) of the frictional force between the box and the spring
D) of the electrostatic force between the box and the spring
Correct Answer: A
Solution :
Weight of an object is the measure of gravitational force between the object and Earth or any other planet. Hence, when a wooden box is suspended by a spring balance, the spring stretches because Earths gravitational force pulls the box. The correct answer is A.
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