When a plastic comb is placed next to a small piece of aluminium foil hanging from a nylon thread, the foil is repelled by the comb.
Why is this?
1 )
The comb is charged and the foil is uncharged.
2 )
The comb is uncharged and the foil is charged.
3 )
The comb and the foil have charge of opposite signs.
The comb and the foil have charge of the same sign.
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