Three Pith Balls Supported by Insulating Threads Hang from a Support

question 19

Multiple Choice

Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that

• A) Y has a negative charge.
• B) Z has a negative charge.
• C) Y has a positive charge.
• D) Z has a positive charge.
• E) Z is neutral (has no net charge.)

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