Answer to Question #61328 in Electricity and Magnetism for muhammad umar

Question

7) What are the dimensions of the constant k in Coulomb’s law of electrostatics?

a) ML2T−4T−2A−1

b) ML2T3A-2

c) M−2L3T2A−1

d) ML3T−4A−2

8) The two tiny balls shown in the figure have identical masses of 0.20 g each. When suspended from 50-m long string, they make an angle of
37o
to the vertical. If the charges on each ball are the same, how large is each charge?
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a) 0.48μC

b) 0.36μC

c) 0.24μC

d) 0.62μC