Chapter 14: Q5CP (page 557)
Explain in detail, including diagrams, what happens when a negatively charged tape is brought near your finger.
Short Answer
The negatively charged tape gets attracted to the finger.
Chapter 14: Q5CP (page 557)
Explain in detail, including diagrams, what happens when a negatively charged tape is brought near your finger.
The negatively charged tape gets attracted to the finger.
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Get started for freeTwo small, negatively charged plastic spheres are placed near a neutral iron block, as shown in Figure 14.89. Which arrow (aโj) in Figure 14.89 best indicates the direction of the net electric field at location A?
A student asked, "Since the positive nucleus of the atom is hidden inside a negative electron cloud, why doesn't all matter appear to be negatively charged?" Explain to the student the flaw in this reasoning.
Explain briefly why repulsion is a better test for the sign of a charged object than attraction is.
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.
Try rubbing a plastic pen through your hair, and youโll 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 () 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 of a carbon atom. Compare your answer to the measured value of (T. M. Miller and B. Bederson, โAtomic and molecular polarizabilities: a review of recent advances,โ Advances in Atomic and Molecular Physics, 13, 1โ55, 1977).(d) Carefully list all assumptions and approximations.
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