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When a glass is rubbed with silk, the rod becomes positively charged, but when a rubber rod is rubbed with fur, the rubber becomes negatively charged. Suppose you have a charged object but don't know whether its charge is positive or negative. Explain how you could use a glass rod and a piece of silk to determine the sign of the unknown charge on the object. 

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Rochelle Enrera
Rochelle EnreraLv10
28 Oct 2020

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Related textbook solutions

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

Related questions

When a glass rod is rubbed with silk, it becomesnegative- yet both attract dust. Does the dust have a third type of charge that is attracted to both positive and negative? Explain.

I NEED THIS ANSWERED BEFORE MIDNIGHT PST! I WILL RATELIFESAVER!

A very thin glass rod 4 meters long is rubbed all over with a silkcloth. It gains a uniformly distributed charge 1.6X10^–6 C. Twosmall spherical rubber balloons of radius 1.2 cm are rubbed allover with wool. They each gain a uniformly distributed charge of-8X10^–8 C. The balloons are near the midpoint of the glass rod,with their centers 3 cm from the rod. The balloons are 2 cm apart(4.4 cm between centers).




(a) Find the net electric field at the location marked by the X,0.6 cm to the right of the center of the left balloon. Things tothink about: Which objects make nonzero contributions to E field atthis location? What are the correct distances from sources to theobservation location? What is the direction of E field due to therod? (The drawing is not to scale; read the problem statementcarefully. Assume the +x axis is to the right, the +y axis is up,and the +z axis is out.)

E = ________ N/C

(b) What approximations did you make, if any? Which apply(1-4)?
1. Neglect polarization of balloons.
2. Use approximate formula for electric field of a chargedspherical shell.
3. Neglect polarization of rod.
4. Assume distance to observation location is small compared tolength of rod.

(c) Next a proton is placed at that same location (marked by thex). What is the force acting on the proton?

F = ________ N
Note: in parts (a) and (c) there should be an arrow over the"E" and the "F" but the custom equation function would not workproperly.

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.

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