Question 9
Source instructions: For multiple choice problems circle the right answers. Some problems may have more than one right answer. For essay problem, give explanation briefly.
An iron ball with positive charge +Q is hanging with a thin string as shown in the diagram below.
At the beginning, the ball and the needle are at rest. If we swing the ball, then what will happen to the needle?
a. move backward and forward.
b. remain at rest.
Explain your answer.
An iron ball with positive charge +Q is hanging with a thin string as shown in the diagram below.
At the beginning, the ball and the needle are at rest. If we swing the ball, then what will happen to the needle?
a. move backward and forward.
b. remain at rest.
Explain your answer.