A student investigates the electrostatic charges on three objects P, Q and R.
The student places object P on the insulated pan of a balance and notes the reading on the balance.
The student then holds object Q a small distance above object P and notes the reading on the balance.
Finally, the student holds object R the small distance above object P and notes the reading on the balance.
The student’s observations are shown.
Which row gives possible charges that explain these observations?
1 )
charge on P:negative / charge on Q:positive / charge on R:negative
2 )
charge on P:negative / charge on Q:negative / charge on R:negative
charge on P:positive / charge on Q:positive / charge on R:negative
4 )
charge on P:positive / charge on Q:negative / charge on R:positive
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