In The diagram at right, charge A is fixed. We can move charge B. We know that i

Question

In The diagram at right, charge A is fixed. We can move charge B. We know that if we did not hold onto charge B then the (repulsive) electrical force due to charge A would cause B to accelerate away from charge A. Suppose that we hold onto charge B and move it towards charge A very slowly so that its speed is nearly zero through die whole motion. Which way do we have to exert a force on charge B during this motion? In die motion described above, did we do positive work or negative work on charge B? If we move charge B closer to A, as described above will we have increased or decreased the system's electric potential energy? Now we will apply die same reasoning to opposite charges. In the diagram at right, charge A is fixed. We can move charge B. If we slowly move charge B closer to A which way must we exert a force on charge B so that it moves very slowly through die whole motion? In die motion described above, did we do positive or negative work on charge B? If we move charge B closer to A, as described above will we have increased or decreased the system's electric potential energy? The electric potential at A is 20 V. The electric potential at B 6 V. If we place a 2 C charge at A what will its electric potential energy be? If we place a -1 C charge at B what will its electric potential energy be?

Explanation / Answer

1)we have to apply force = force due to the charge on the other towards left

we do -ve work

increase

2) towards left

positive

decrease

3) 40 and -6 joules

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