Which of the following could be reasonable explanations for how a piece of invisible tape gets charged? Select all that apply. (1) Protons are pulled out of nuclei in one tape and transferred to another tape. (2) Charged molecular fragments are broken off one tape and transferred to another. (3) Electrons are pulled out of molecules in one tape and transferred to another tape. (4) Neutrons are pulled out of nuclei in one tape and transferred to another tape.

Short Answer

Expert verified

2 and 3.

Step by step solution

01

Significance of the electric field for the invisible tape

The electric field is referred to as a type of electric property that is associated with different points in the space when the charge is present in different forms.

The electric field gives the reason for which the piece of the invisible tape gets charged.

02

Determination of the reason for which the invisible tape gets charged

As the electrons get transferred from one material to a different material, then as the valence shell’s electron of an object is loosely attached, then the shell is being completed by the electrons of other material. Hence, this is the way in which the electrons transfer.

Point 1 states that proton neutrons are being pulled out from the tape. However, this point is incorrect as a massive amount of energy is needed to pull out the proton and a tape cannot do it.

Points 4 states that the neutrons are being pulled out from the tape. However, this point is incorrect as a massive amount of energy is needed to pull out the neutron and a tape cannot do it.

Point 2 states that the charged molecular fragments are broken off one tape and transferred to another. This point is correct as it is easier to break the chemical bonding of the tape that requires less amount of energy which can be possible to charge a tape.

Point 3 directly resembles the above explanation as the electrons can be pulled out from the tape as less amount of energy is needed to pull them out from the tape. Moreover, the energy to pull out the electrons can be obtained only by rubbing the tapes.

Thus, points 2 and 3 are the reasonable explanation for how a piece of invisible tape gets charged.

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Most popular questions from this chapter

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.

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.

Explain in detail, including diagrams, what happens when a negatively charged tape is brought near your finger.

Try rubbing a plastic pen through your hair, and you’ll find that you can pick up a tiny scrap of paper when the pen is about one centimeter above the paper. From this simple experiment you can estimate how much an atom in the paper is polarized by the pen! You will need to make several assumptions and approximations. Hints may be found at the end of the chapter. (a) Suppose that the center of the outer electron cloud (q=-4e) of a carbon atom shifts a distance s when the atom is polarized by the pen. Calculate s algebraically in terms of the charge Q on the pen. (b) Assume that the pen carries about as much charge Q as we typically find on a piece of charged invisible tape. Evaluate s numerically. How does this compare with the size of an atom or a nucleus? (c) Calculate the polarizability αof a carbon atom. Compare your answer to the measured value of 1.96×10-40C.m/(N/C)(T. M. Miller and B. Bederson, “Atomic and molecular polarizabilities: a review of recent advances,” Advances in Atomic and Molecular Physics, 13, 1–55, 1977).(d) Carefully list all assumptions and approximations.

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