Coulombs Worksheet

Coulomb’s Law Worksheet Solutions

1. Two charged spheres 10 cm apart attract each other with a force of 3.0 x 10( 6 N. What force results from each of the following changes, considered separately?

a) Both charges are doubled and the distance remains the same.

b) An uncharged, identical sphere is touched to one of the spheres, and then taken far away.

c) The separation is increased to 30 cm.

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2. The force of electrostatic repulsion between two small positively charged objects, A and B, is 3.6 x 10 ( 5 N when AB = 0.12m. What is the force of repulsion if AB is increased to

a) 0.24 m b) 0.36 m

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3. Calculate the force between charges of 5.0 x 10 ( 8 C and 1.0 x 10 ( 7 C if they are 5.0 cm apart.

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4. What is the magnitude of the force a 1.5 x 10 ( 6 C charge exerts on a 3.2 x 10 ( 4 C charge located 1.5 m away?

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5. Two spheres; 4.0 cm apart, attract each other with a force of 1.2 x 10 ( 9 N. Determine the magnitude of the charge on each, if one has twice the charge (of the opposite sign) as the other.

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6. Two equal charges of magnitude 1.1 x 10 ( 7 C experience an electrostatic force of 4.2 x 10 ( 4 N. How far apart are the centers of the two charges?

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7. How many electrons must be removed from a neutral, isolated conducting sphere to give it a positive charge of 8.0 x 10 ( 8 C?

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8. What will be the force of electric repulsion between two small spheres placed 1.0 m apart, if each has a deficit of 108 electrons?

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9. Two identical, small spheres of mass 2.0 g are fastened to the ends of a 0.60m long light, flexible, insulating fishline. The fishline is suspended by a hook in the ceiling at its exact centre. The spheres are each given an identical electric charge. They are in static equilibrium, with an angle of 30( between the string halves, as shown. Calculate the magnitude of the charge on each sphere. (Hint:...