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Chapter 14: Q31P (page 581)

Which observation provides evidence that two objects have the same sign charge? (a) The two objects repel each other. (b) The two objects attract each other. (c) The two objects do not interact at all. (d) The strength of the interaction between the two objects depends on distance.

Short Answer

Expert verified

Statement (a) provides evidence that two objects have the same sign charge.

Step by step solution

01

Significance of the law of attraction

The law of attraction states that two like charges repel each other and the two unlike charges attract each other.

02

Explanation of when two objects repel each other

Statement (b) states that the two objects attract each other. This option is incorrect as according to the law of attraction, two equally charged objects repel each other.

Statement (c) states that two objects do not interact at all. This option is incorrect as according to the law of attraction, the same sign-charged objects repel each other.

Statement (d) states that the strength of the interaction between the two objects depends on the distance. This statement is incorrect as the attraction between the objects does not only depends on the distance.

Statement (a) states that the two objects repel each other. This option is correct as according to the law of attraction, two equally charged objects repel each other.

Thus, statement (a) provides evidence that two objects have the same sign charge.

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Most popular questions from this chapter

Blocks A and B are identical metal blocks. Initially block A is neutral, and block B has a net charge of5nC.Using insulating handles, the blocks are moved so they touch each other. After touching for a few seconds, the blocks are separated (again using insulating handles). (a) What is the final charge of block A? (b) What happened while the blocks were in contact with each other? (1) Protons moved from block B to block A. (2) Positrons moved from block B to block A. (3) Electrons moved from block A to block B. (4) Both protons and electrons moved. (5) No charged particles moved.

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.

Which of the following are true? Check all that apply. (1) If the net electric field at a particular location inside a piece of metal is zero, the metal is not in equilibrium. (2) The net electric field inside a block of metal is zero under all circumstances. (3) The net electric field at any location inside a block of copper is zero if the copper block is in equilibrium. (4) The electric field from an external charge cannot penetrate to the center of a block of iron. (5) In equilibrium, there is a net flow of mobile charged particles inside a conductor.

An electric field is applied to a solution containing bromide ions. As a result, the ions move through the solution with an average drift speed of 3.7×10-7m/s. The mobility of bromide ions in solution is 8.1×10-8(m/s)(N/C). What is the magnitude of the net electric field inside the solution?

8 (a) An object can be both charged and polarized. On a negatively charged metal ball, the charge is spread uniformly all over the surface (Figure 14.42). If a positive charge is brought near, the charged ball will polarize. If any of the following quantities is zero, state this explicitly. (1) Draw the approximate final charge distribution on the ball. (2) At the center, draw the electric field due to the external positive charge. (3) At the center, draw the electric field due to the charge on the surface of the ball. (4) At the center, draw the net electric field.

(b) Next, consider a negatively charged plastic pen that is brought near a neutral solid metal cylinder (Figure 14.43). If any of the following quantities is zero, state this explicitly. (1) Show the approximate charge distribution for the metal cylinder. (2) Draw a vector representing the net force exerted by the pen on the metal cylinder, and explain your force vector briefly but completely, including all relevant interactions. (3) At the center, draw the electric field due to the external negative charge. (4) At the center, draw the electric field due to the charge on the surface of the ball. (5) At the center, draw the net electric field.

(c) Replace the solid metal cylinder with a solid plastic cylinder. (1) Show the approximate charge distribution for the plastic cylinder. (2) Draw a vector representing the net force exerted by the pen on the plastic cylinder. (3) Explain your force vector briefly but completely, including all relevant interactions.
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