In an experiment the following observations are made by a student for four charged objects W, X, Y, and Z:  • A glass rod rubbed with silk attracts W. • W attracts Z but repels X. • X attracts Z but repels Y. • Y attracts W and Z. Estimate whether the charges on each of the four objects are positive, negative, or neutral.

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 In an experiment the following observations are made by a student for four charged objects W, X, Y, and Z: 

• A glass rod rubbed with silk attracts W.

• W attracts Z but repels X.

• X attracts Z but repels Y.

• Y attracts W and Z.

Estimate whether the charges on each of the four objects are positive, negative, or neutral.

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