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?
Click here to see exhibit

a) 0.48μC

b) 0.36μC

c) 0.24μC

d) 0.62μC