Consider the situation in the figure below; a neutral conducting ball hangs from the ceiling by an insulating string, and a charged insulating rod is going to be placed nearby. A. First, if the rod was not there, what statement best describes the charge distribution of the ball? 1) Since it is a conductor, all the charges are on the outside of the ball. 2) The ball is neutral, so it has no positive or negative charges anywhere. 3) The positive and negative charges are separated from each other, but we don't know what direction the ball is polarized. 4) The positive and negative charges are evenly distributed everywhere in the ball. B. Now, when the rod is moved close to the ball, what happens to the charges on the ball? 1) There is a separation of charges in the ball; the side closer to the rod becomes positively charged, and the opposite side becomes negatively charged. 2) Negative charge is drawn from the ground (via the string), so the ball acquires a net negative charge. 3) Nothing happens to the charges in the ball. 4) There is a separation of charges in the ball; the side closer to the rod becomes negatively charged, and the opposite side becomes positively charged. 5) Positive charge is drawn from the ground (via the string), so the ball acquires a net positive charge. C. Which of the following statements is correct about the force being applied to the ball when the rod is nearby? 1) There is no force on the ball from the rod, because the ball is neutral. 2) There is no force on the ball from the rod, because the force of gravity and the string cancel it out. 3) The ball is attracted to the rod. 4) There is no force on the ball from the rod, because they are not touching each other. 5) The ball is repelled by the rod.
Consider the situation in the figure below; a neutral
A. First, if the rod was not there, what statement best describes the charge distribution of the ball?
1) Since it is a conductor, all the charges are on the outside of the ball.
2) The ball is neutral, so it has no positive or negative charges anywhere.
3) The positive and negative charges are separated from each other, but we don't know what direction the ball is polarized.
4) The positive and negative charges are evenly distributed everywhere in the ball.
B. Now, when the rod is moved close to the ball, what happens to the charges on the ball?
1) There is a separation of charges in the ball; the side closer to the rod becomes positively charged, and the opposite side becomes negatively charged.
2) Negative charge is drawn from the ground (via the string), so the ball acquires a net negative charge.
3) Nothing happens to the charges in the ball.
4) There is a separation of charges in the ball; the side closer to the rod becomes negatively charged, and the opposite side becomes positively charged.
5) Positive charge is drawn from the ground (via the string), so the ball acquires a net positive charge.
C. Which of the following statements is correct about the force being applied to the ball when the rod is nearby?
1) There is no force on the ball from the rod, because the ball is neutral.
2) There is no force on the ball from the rod, because the force of gravity and the string cancel it out.
3) The ball is attracted to the rod.
4) There is no force on the ball from the rod, because they are not touching each other.
5) The ball is repelled by the rod.
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