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.)


d

Physics & Space Science

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