Question

Two balls are placed near one another and hang down, as shown below.

2 overlapping circles. The left circle is labeled Conduction. The right circle is labeled Induction. An X is in the nonoverlapping part of the left circle.
Which conclusion is supported by this evidence?

Neither ball has a charge.
The balls are both positively charged.
One ball is positively charged, and the other is negatively charged.
Each ball has a charge, but the type of charge is unknown.

Answer 1

Each ball has a charge, but the type of charge is unknown.

Reason: the mark is in the "conduction" only region, so charge was transferred by conduction (touching), which leaves both objects charged (and with the same sign), but the diagram gives no information whether that sign is positive or negative.