Test 1 - MULTIPLE CHOICE _ Choose closest answer 1. A wire...

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MULTIPLE CHOICE _ Choose closest answer 1. A wire contains a steady current of 2 A. The charge that passes a cross section in 2 s is: A) 3.2 × 10 –19 C B) 6.4 × 10 –19 C C) 1 C D) 2 C E) 4 C Ans: E 2. An electrical insulator is a material: A) containing no electrons B) through which electrons do not flow easily C) which has more electrons than protons on its surface D) cannot be a pure chemical element E) must be a crystal Ans: B 3. Two uncharged metal spheres, L and M, are in contact. A negatively charged rod is brought close to L, but not touching it, as shown. The two spheres are slightly separated and the rod is then withdrawn. As a result: A) both spheres are neutral D) L is negative and M is positive B) both spheres are positive E) L is positive and M is negative C) both spheres are negative Ans: E 4. Two small charged objects repel each other with a force F when separated by a distance d . If the charge on each object is reduced to one-fourth of its original value and the distance between them is reduced to d /2 the force becomes: A) F /16 B) F /8 C) F /4 D) F /2 E) F Ans: C 5. Particles 1, with charge q 1 and 2, with a charge q 2 are on the x axis, with particle 1 at x = a with and particle 2 at x = –2 a . For the net force on a third charged particle, at the origin to be zero q 1 and q 2 must be related by q 2 =: A) 2 q 1 B) 4 q 1 C) –2 q 1 D) –4 q 1 E) q 1 /4 Ans: B Page 167
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Test 1 - MULTIPLE CHOICE _ Choose closest answer 1. A wire...

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