 ### Tut 1 Coulomb

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1. What is the charge on 1 electron, and what is the charge of 1 proton?

2. Calculate the number of electrons responsible for a charge of -4 x 10-14C.

3. Object A has a charge of -8nC and object B has a charge of 4nC.
3.1. Will A and B attract or repel each other? Why?
3.2. A and B are brought into contact with each other. Calculate the new charges of A and B.
3.3. Will A and B attract or repel each other? Why
3.4. In which direction will charge be transferred, from A to B or from B to A?
3.5. Calculate the amount of charge transferred.
3.6. Calculate the number of electrons transferred.

4. The charge of sphere X is 8nC. When it was brought into contact with sphere Y, the charge of X became 5nC. Calculate the original charge of Y.

5. Two objects A and B carry charges of -8nC and 2nC. They are placed a distance of 0,02m apart.
Calculate the magnitude of the electrostatic force between them.

6. The magnitude of the electrostatic force between charges X and Y placed 24mm apart is 3 x 10-5N. The charge on X is 6μC. Calculate the magnitude of the charge on Y.

7. How far apart should two charges each of magnitude 5nC be placed so that the electrostatic force between them becomes 4 x 10-7N?

8. Two identical point charges repel each other with a force of 0,25 x 10-3 N. If the distance between them is 50mm calculate the charge of each.

9. As two oppositely charged objects gradually and continuously approach each other, what effect would this have on the magnitude of electrostatic force between them? Show by means of a graph.

10. What is the charge of a magnesium ion in coulombs?