Final answer:
To calculate the work done on a charge by electric forces, use the formula Work = q3 * V, where q3 is the charge and V is the potential difference between the two points. To find V, use the formula V = k * (q1/r1 + q2/r2), where k is the electrostatic constant, q1 and q2 are the charges, and r1 and r2 are the distances. Substitute V into the work formula to find the work done on q3.
Step-by-step explanation:
The work done on a charge by electric forces can be calculated using the formula:
Work = q3 * V
where q3 is the charge and V is the potential difference between the two points.
In this case, to find the work done on q3 by the electric forces exerted by q1 and q2, we need to calculate the potential difference between point a and point b. This can be done by using the formula:
V = k * (q1/r1 + q2/r2)
where k is the electrostatic constant, q1 and q2 are the charges, and r1 and r2 are the distances from q1 and q2 to the point where the potential difference is being calculated.
Once we have the potential difference, we can substitute it into the work formula to find the work done on q3.