A positively charged glass rod was brought to the uncharged hollow metal ball of the electrometer, without touching it. In this case, the electrometer needle deviated from its original position:
a) Name a body whose charge is created by an external electric field.
b) What sign has the charge on the side of the ball facing the glass rod?
c) What are the signs of charges on the rod and arrow of the electrometer?
a) glass rod; b) negative; c) positive.
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