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23 Nov 2019

5. A plastic rod has been rubbed with a scratchy brownpapertowel. You have carefully tested the rod and found that it hasanegative charge. If you place the rod on your handy dandyspinner,and then bring a magnet near it, the rod will


be repelledby the magnet
be attracted to themagnet.
depends on whichend of the magnet you hold near the rod.
be nietherattracted nor repelled by the magnet.

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Irving Heathcote
Irving HeathcoteLv2
20 Feb 2019
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

This problem explores the behavior of charge on groundedconductors. We take as an example a long conducting rod suspendedby conducting wires that are connected to ground. Assume that therod is initially electrically neutral. For convenience, we willrefer to the left end of the rod as end A, and the right end of therod as end B . In the answer options for this problem, "stronglyattracted/repelled" means "attracted/repelled with a force ofmagnitude similar to that which would exist between two chargedballs."

A small metal ball is given a negative charge, then brought near(i.e., within about 1/10 the length of the rod) to end A of therod. What happens to end A of the rod when the ball approaches itclosely this first time?

strongly repelled
strongly attracted
weakly attracted
weakly repelled
neither attracted nor repelled

Now consider what happens when the small metal ball is repeatedlygiven a negative charge and then brought into contact with end A ofthe rod.

After a great many contacts with the charged ball, how is anycharge on the rod arranged (when the charged ball is faraway)?

positive charge on end B and negative charge on end A
negative charge spread evenly on both
negative charge on end A with end B remaining neutral
both ends neutral
positive charge spread evenly on both

How does end A of the rod react when the (re)charged ballapproaches it after a great many previous contacts with endA?

strongly repelled
strongly attracted
weakly attracted
weakly repelled
neither attracted nor repelled

How does end B of the rod react when the charged ball approaches itafter a great many previous contacts with end A?

strongly repelled
strongly attracted
weakly attracted
weakly repelled
neither attracted nor repelled



Consider 4 lightweight metal-coated balls suspended on nonconducting threads. Suppose ball A is stroked with a plastic rod that has been rubbed with fur. When you observe interactions between pairs of balls one at a time you find that:

1. B, C, and D are each attracted to A.
2. B and D seem to have no effect on each other.
3. B is attracted to C.

Use the concept of induction to figure out what type of net charge is on each of the balls: Negative charge? Positive charge?No charge at all? Explain your reasoning. 
Four lightweight balls A,B,C and D are suspended by threads.
Ball A has been touched by a plastic rod that was rubbed with wool.
When the balls are brought close together, without touching, the
following observations are made:

1) Balls B, C and D are attracted to ball A.
2) Balls B and D have no effect on each other.
3) Ball B is attracted to ball C.

What are the charge states (positive, negative, or neutral) of balls
A, B, C and D? Explain your reasoning.

Can someone please help me solve this problem? Thanks in advance!!

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