1. zero. 2. undetermined. 3. repulsive. 4. attractive. Question 7, chap 123, sec

Question

1. zero. 2. undetermined. 3. repulsive. 4. attractive. Question 7, chap 123, sect 5. part 1 of 1 10 points How does the magnitude of electrical force between a pair of charged objects change when the objects are moved twice as far apart? 1. The force doesn't change. 2. The force reduces to one half of original 3. The force reduces to one quarter of origi- value. nal value. 4. The force doubles. 5. The force quadruples. Question 8, chap 123, sect 5. part 1 of 4 10 points A small cork with an excess charge of

Explanation / Answer

from the coulombs law

intially f1 = kq1q2/d^2

now distance becomes twice

f2 = kq1q2/(2d)^2

f2/f1 = 1/4d^2/1/d^2 = d^2/4d^2

f2/f1 = 1/4

f2 = f1/4

1/4 times the inital magnitude of electric force

so option is 3

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