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.

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

You place a neutral block of nickel near a small glass sphere that has a charge of 2×10-8Cuniformly distributed over its surface, as shown in Figure 14.92.


(a) About how long do you have to wait to make sure that the mobile electron sea inside the nickel block has reached equilibrium? (1) Less than a nanosecond (1×10-9s), (2) Several hours, (3) About 1s, (4) About 10min(b) In equilibrium, what is the average drift speed of the mobile electrons inside the nickel block? (1) About 1×105m/s, (2) About 1×10-5m/s, (3) 0m/s(c) In the equation v¯=uE, what is the meaning of the symbol u? (1) The density of mobile electrons inside the metal, in localid="1657175774793" electrons/m3, (2) The mobility of an electron inside the metal, in m/s/N/C, (3) The time it takes a block of metal to reach equilibrium, in seconds

A negatively charged iron block is placed in a region where there is an electric field downward (in the Y − direction) due to charges not shown. Which of the diagrams (a–f) in Figure 14.88 best describes the charge distribution in and/or on the iron block?

The mobility of the mobile electrons in copper is4.5×10-3(m/s)/(N/C). How large an electric field would be required to give the mobile electrons in a block of copper a drift speed of 1×10-3m/s?

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