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Chapter 14: Q29P (page 580)

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鈥檚 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

A student said, 鈥淲hen you touch a charged piece of metal, the metal is no longer charged: all the charge on the metal is neutralized.鈥� As a practical matter, this is nearly correct, but it Isn鈥檛 exactly right. What鈥檚 wrong with saying that all the charge on the metal is neutralized?

You take two invisible tapes of some unknown brand, stick them together, and discharge the pair before pulling them apart and hanging them from the edge of your desk. When you bring an uncharged plastic pen withinof10CM either the U tape or the L tape you see a slight attraction. Next you rub the pen through your hair, which is known to charge the pen negatively. Now you find that if you bring the charged pen withinrole="math" localid="1655718752350" 8CMof the L tape you see a slight repulsion, and if you bring the pen withinrole="math" localid="1655718766744" 12CMof the U tape you see a slight attraction. Briefly explain all of your observations.

Which of the following are true? Select all that apply. (1) In equilibrium, there is no net flow of mobile charged particles inside a conductor. (2) The electric field from an external charge cannot penetrate to the center of a block of iron. (3) The net electric field inside a block of aluminum is zero under all circumstances. (4) If the net electric field at a particular location inside a piece of metal is not zero, the metal is not in equilibrium. (5) The net electric field at any location inside a block of copper is zero if the copper block is in equilibrium.

Is the following statement true or false? If true, what principle makes it true? If false, give a counterexample or say why. See Figure 14.67.

鈥淭he electric field Epointat the center of an induced dipole, due to the point charge, is equal in magnitude and opposite in direction to the electric field Edipoleat the location of the point charge, due to the induced dipole.鈥�

: A thin, hollow spherical plastic shell of radius \({\bf{R}}\)carries a uniformly distributed negative charge \({\bf{ - Q}}\). A slice through the plastic shell is shown in Figure 14.95. To the left of the spherical shell are four charges packed closely together as shown (the distance \({\bf{s}}\) is shown greatly enlarged for clarity). The distance from the center of the four charges to the center of the plastic shell is \({\bf{L}}\) , which is much larger than \({\bf{s}}\left( {{\bf{L}} \gg {\bf{s}}} \right)\). Remember that a uniformly charged sphere makes an electric field as though all the charge were concentrated at the center of the sphere.

(a)Calculate the \({\bf{x}}\) and \({\bf{y}}\) components of the electric field at location B, a distance \({\bf{b}}\) to the right of the outer surface of the plastic shell. Explain briefly, including showing the electric field on a diagram. Your results should not contain any symbols other than the given quantities \({\bf{R,Q,q,s,L}}\), and \({\bf{b}}\)(and fundamental constants). You need not simplify the final algebraic results except for taking into account the fact that \({\bf{L}} \gg {\bf{s}}\).

(b)What simplifying assumption did you have to make in part (a)?

(c)The plastic shell is removed and replaced by an uncharged metal ball, as in Figure 14.96. At location Ainside the metal ball, a distance \({\bf{b}}\)to the left of the outer surface of the ball, accurately draw and label the electric field\({{\bf{\vec E}}_{{\bf{ball}}}}\) due to the ball charges and the electric field \({{\bf{\vec E}}_{\bf{4}}}\) of the four charges. Explain briefly.

(d)Show the distribution of ball charges.

(e)Calculate the \({\bf{x}}\) and \({\bf{y}}\) components of the net electric field at location A.
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