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1. Two (2) small plastic spheres are given positive electrical charge.When ther 15cm apart, the repulse force between then has a magnitude of 0.22N. What is the charge on each sphere if; two (2) charges are equal one (1) sphere has four (4) times the charge of the other.

1. Two (2) small plastic spheres are given positive electrical charge.When ther 15cm apart, the repulse force between then has a magnitude of 0.22N. What is the charge on each sphere if;
  1. two (2) charges are equal
  2. one (1) sphere has four (4) times the charge of the other.

Grade:8

1 Answers

Arun
25750 Points
5 years ago
Just use F = kQq / d² 

a) 0.220 N = 8.99e9N·m²/C² * Q² / (0.15m)² 
Q = 7.42e-7 C = 742 nC 

b) 0.220 N = 8.99e9N·m²/C² * 4Q * Q / (0.15m)² 
Q = 3.71e-7 C 
4Q = 1.48e-6 C = 1.48 µC 

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