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# ch21 - Chapter 21 1 A coulomb is the same as A an...

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Chapter 21: ELECTRIC CHARGE 1. A coulomb is the same as: A. an ampere/second B. half an ampere · second 2 C. an ampere/meter 2 D. an ampere · second E. a newton · meter 2 ans: D 2. A kiloampere · hour is a unit of: 3. The magnitude of the charge on an electron is approximately: 4. The total negative charge on the electrons in 1 mol of helium (atomic number 2, molar mass 4) is: 5. The total negative charge on the electrons in 1 kg of helium (atomic number 2, molar mass 4) is: A. 48 C B. 2 . 4 × 10 7 C C. 4 . 8 × 10 7 C D. 9 . 6 × 10 8 C E. 1 . 9 × 10 8 C ans: C Chapter 21: ELECTRIC CHARGE 321

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6. A wire carries a steady current of 2 A. The charge that passes a cross section in 2 s is: 7. A wire contains a steady current of 2 A. The number of electrons that pass a cross section in 2 s is: 8. The charge on a glass rod that has been rubbed with silk is called positive: 9. To make an uncharged object have a negative charge we must: A. add some atoms B. remove some atoms C. add some electrons D. remove some electrons E. write down a negative sign ans: C 10. To make an uncharged object have a positive charge: 322 Chapter 21: ELECTRIC CHARGE
11. When a hard rubber rod is given a negative charge by rubbing it with wool: 12. An electrical insulator is a material:

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