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Chapter 14: Q10Q (page 578)

A positive charge is located between a neutral block of plastic and a neutral block of copper (Figure 14.68). Draw the approximate charge distribution for this situation.

Short Answer

Expert verified

The electric charge on the plastic block would be non-uniform whereas the distribution of the electric charge on the copper block would be uniform.

Step by step solution

01

Understanding the electric charge distribution

In this problem, the concept of electric charge distribution on the surface of a neutral block due to a specific point charge placed near/ close to the neutral block. The distribution of electric charge on a non-conducting block would be non-uniform in comparison to a conducting block.

02

Representation of the approximate charge distribution on the neutral plastic and copper blocks

A positive charge is located between a neutral block of plastic and a neutral block of copper. The representation of electric charge separation takes place in both blocks, as given below.

The distribution of the electric charge takes place uniformly on the surface of the copper block, whereas the distribution of the electric charge takes place non-uniform on the surface of the plastic block.

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Most popular questions from this chapter

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

This question focuses on reasoning about equilibrium inside the nickel block shown in Figure 14.92. Start with these premises:

  • The definition of equilibrium inside a conductor and
  • The relationship between average drift speed and electric field

in a conductor to reason about which situations are possibleinside the nickel block at equilibrium. Some of the situations listed below are possible, some are ruled out by one premise, and some are ruled out by two premises. If a situation is ruled out by two premises, choose both.

Case 1:\({\bf{\bar v = 0}}\)and \({{\bf{E}}_{{\bf{net}}}}{\bf{ = 0}}\) (1) Possible, (2) Not possible by definition of equilibrium, (3) Not possible because \({\bf{\bar v = u}}{{\bf{E}}_{{\bf{net}}}}\)

Case 2:\({\bf{\bar v = 0}}\)and \({{\bf{E}}_{{\bf{net}}}}{\bf{ > 0}}\) (1) Possible, (2) Not possible by definition of equilibrium, (3) Not possible because \({\bf{\bar v = u}}{{\bf{E}}_{{\bf{net}}}}\)

Case 3:\({\bf{\bar v > 0}}\)and \({{\bf{E}}_{{\bf{net}}}}{\bf{ = 0}}\) (1) Possible, (2) Not possible by definition of equilibrium, (3) Not possible because \({\bf{\bar v = u}}{{\bf{E}}_{{\bf{net}}}}\)

Case 4:\({\bf{\bar v > 0}}\)and \({{\bf{E}}_{{\bf{net}}}}{\bf{ > 0}}\) (1) Possible, (2) Not possible by definition of equilibrium, (3) Not possible because \({\bf{\bar v = u}}{{\bf{E}}_{{\bf{net}}}}\)

Now that you have considered each case, in equilibrium, which one is the only situation that is physically possible? (1) Case 1, (2) Case 2, (3) Case 3, (4) Case 4

A student said, “When you touch a charged piece of metal, the metal is no longer charged: all the charge on the metal is neutralized.” As a practical matter, this is nearly correct, but it Isn’t exactly right. What’s wrong with saying that all the charge on the metal is neutralized?

Metal sphere A is charged negatively and then brought near an uncharged metal sphere B (Figure 14.78). Both spheres rest on insulating supports, and the humidity is very low.

(a) Use +’s and −’s to show the approximate distribution of charges on the two spheres. (Hint: Think hard about both spheres, not just B.)

(b) A small, lightweight hollow metal ball, initially uncharged, is suspended from a string and hung between the two spheres (Figure 14.79). It is observed that the ball swings rapidly back and forth hitting one sphere and then the other. This goes on for seconds, but then the ball stops swinging and hangs between the two spheres. Explain in detail, step by step, why the ball swings back and forth and why it finally stops swinging. Your explanation must include good physics diagrams.

In Figure 14.84 there is a permanent dipole on the left with dipole moment μ1=Qs1 and a neutral atom on the right with polarizabilityα , so that it becomes an induced dipole with dipole moment μ2=Qs2=αE1, whereE1 is the magnitude of the electric field produced by the permanent dipole. Show that the force the permanent dipole exerts on the neutral atom isF≈(14πε0)212αμ12r7
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