Question

question 5 of 25 which of the situations described below is explained by the electrical force? a. a childs hair stands on end after she removes a stocking cap on a cold day. b. a race car traveling around a curve is pressed down into the banked track. c. a compass needle swings around so that it points due north. d. a rock sits at rest on the side of a hill, despite the gravitational force.

Explanation:

• Option A: When a child removes a stocking - cap, friction causes a transfer of electrons, creating static electricity. The electrical force between the charged hair strands causes them to stand on end.
• Option B: This is due to the normal force and centripetal force acting on the race - car on the banked track, not the electrical force.
• Option C: This is due to the magnetic force exerted by the Earth's magnetic field on the compass needle, not the electrical force.
• Option D: This is due to the balance between the gravitational force and the normal force and friction on the rock, not the electrical force.

Answer:

A. A child's hair stands on end after she removes a stocking cap on a cold day.