+9 A metal ball is suspended by a string. A positively charged plastic ruler is

Question

+9 A metal ball is suspended by a string. A positively charged plastic ruler is placed near the ball, which is observed to be attracted to the ruler. What can we say for certain about the metal ball? 3. +q Twelve equal charges +q are equally spaced in a circle with radius R. 4. tq What is the net force (magnitude and direction) on a charge +Q at the center? +q a. b. If we remove the +q charge which is located at “3- o'clock", what will be the force on the charge +Q at the center of the circle? 4 14 from Ch 25

Explanation / Answer

3)

The metal ball is either electrically neutral or negatively charged.

Explanation:

If the ball is already negatively charged, then it will be attracted toward the ruler. There is another possibility, however—the ball could be neutral and charged ruler could polarize mobile charges in the ball, causing it to be attracted to the ruler.

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