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Chapter 14: Q8Q (page 578)

Explain briefly why repulsion is a better test for the sign of a charged object than attraction is.

Short Answer

Expert verified

Repulsion is a better test for the sign of a charged object than attraction is.

Step by step solution

01

Concept

A charged object attracts oppositely charged objects and uncharged objects also.So, when a charged object is brought near a body, if the force is attractive, the body could be oppositely charged or uncharged, which was then induced due to the charged body that was brought close to this and will have the opposite charge. But repulsionhappens between two like charges.

02

Step 2:Repulsion as a test  

So, when a charged body is brought near another body,if repulsive force is experienced, it could be sure that the body has the same type of charge as the charged body.So, repulsion is better in identifying whether a body is uncharged.

Thus, repulsion is a better test for the sign of a charged object than attraction is.

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Most popular questions from this chapter

A metal ball with diameter of a half a centimeter and hanging from an insulating thread is charged up with 1×1010excess electrons. An initially uncharged identical metal ball hanging from an insulating thread is brought in contact with the first ball, then moved away, and they hang so that the distance between their centers is 20cm.

(a) Calculate the electric force one ball exerts on the other, and state whether it is attractive or repulsive. If you have to make any simplifying assumptions, state them explicitly and justify them.

(b) Now the balls are moved so that as they hang, the distance between their centers is only 5cm. Naively one would expect the force that one ball exerts on the other to increase by a factor of 42=16, but in real life the increase is a bit less than a factor of role="math" localid="1661330186132" 16. Explain why, including a diagram. (Nothing but the distance between centers is changed—the charge on each ball is unchanged, and no other objects are around.)

A positively charged sphere is placed near a neutral block of nickel, as shown in Figure 14.92. (a) Which of the diagrams in Figure 14.93 best represents the equilibrium distribution of charge on the neutral nickel block?

(b) At location P inside the nickel block the electric field due to the charged sphere is <-625,0,0>N/C. At equilibrium, which of the following statements must be true? (1) It is not possible to determine the electric field at location P due only to charges on the surface of the nickel block. (2) The electric field at location P due only to charges on the surface of the nickel block is <0,0,0>N/C. (3) Because the net electric field at location P is <0,0,0>N/C, the field at P due only to charges on the surface of the polarized nickel block must be <625,0,0>N/C.

Atom Ais easier to polarize than atom B. Which atom, Aor B, would experience a greater attraction to a point charge a distance raway? Explain your reasoning.

An electric field of magnitude 190  N/C is applied to a solution containing chloride ions. The mobility of chloride ions in solution is 7.91×10-8  (m/s)/(N/C).What is the average drift speed of the chloride ions in the solution?

Make a table showing the major differences in the electric properties of plastic, salt water, and copper. Include diagrams showing polarization by an external charge.
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