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Chapter 16: Q1Q (page 443)

If you charge a pocket comb by rubbing it with a silk scarf, how can you determine if the comb is positively or negatively charged?

Short Answer

Expert verified

After rubbing the comb with the silk scarf, you put the comb near a positively charged object. If the positive object repeals the comb, then there is a positive change in the comb, but if the positive object attracts the comb, there is a negative change.

Step by step solution

01

Concepts

The same charge repels and the opposite charge attracts.

For this problem, the comb should be near a positive charge object after rubbing.

02

Explanation

After rubbing the comb with the silk scarf, you put the comb near a positively charged object. If the positive object repeals the comb, then there is a positive change in the comb, but if the positive object attracts the comb, there is a negative change.

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Most popular questions from this chapter

(II) The electric field midway between two equal but opposite point charges is\({\bf{386 N/C}}\)and the distance between the charges is 16.0 cm. What is the magnitude of the charge on each?

(II) A large electroscope is made with “leaves” that are 78-cm-long wires with tiny 21-g spheres at the ends. When charged, nearly all the charge resides on the spheres. If the wires each make a 26° angle with the vertical (Fig. 16–55), what total charge Q must have been applied to the electroscope? Ignore the mass of the wires.

Explain why the test charges we use when measuring electric fields must be small.

(I) What is the magnitude of the electric force of attraction between an iron nucleus (q = +26e) and its innermost electron if the distance between them is\({\bf{1}}{\bf{.5 \times 1}}{{\bf{0}}^{{\bf{ - 12}}}}\;{\bf{m}}\)?

(I) What is the magnitude of the force a\({\bf{ + 25}}\;{\bf{\mu C}}\)charge exerts on a\({\bf{ + 2}}{\bf{.5}}\;{\bf{mC}}\)charge 16 cm away?
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