Week1concepts.pdf - ConcepTest 21.1a Electric Charge I ConcepTest 21.1a Electric Charge I 1 one is positive the other is negative Two charged balls are

Week1concepts.pdf - ConcepTest 21.1a Electric Charge I...

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1 Page 1 ConcepTest 21.1a Electric Charge I 1) one is positive, the other is negative 2) both are positive 3) both are negative 4) both are positive or both are negative Two charged balls are repelling each other as they hang from the ceiling. What can you say about their charges? ConcepTest 21.1a Electric Charge I The fact that the balls repel each other can tell you only that they have the same charge , but you do not know the sign. So they can be either both positive or both negative. 1) one is positive, the other is negative 2) both are positive 3) both are negative 4) both are positive or both are negative Two charged balls are repelling each other as they hang from the ceiling. What can you say about their charges? Follow - up: What does the picture look like if the two balls are oppositely charged? What about if both balls are neutral? ConcepTest 21.2a Conductors I 1) positive 2) negative 3) neutral 4) positive or neutral 5) negative or neutral A metal ball hangs from the ceiling by an insulating thread. The ball is attracted to a positive -charged rod held near the ball. The charge of the ball must be: Clearly, the ball will be attracted if its charge is negative . However, even if the ball is
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