When the charge moves between points with a potential difference of 1 kV

When the charge moves between points with a potential difference of 1 kV, the field performs work of 40 μJ. What is the charge?

To calculate the value of the taken charge, we will use the formula: q = A / (φ1 – φ2).
Values of variables: φ1 – φ2 – potential difference (φ1 – φ2 = 1 kV = 1 * 10 ^ 3 V); A is the work done by the field (A = 40 μJ = 40 * 10 ^ -6 J).
Let’s make a calculation: q = A / (φ1 – φ2) = 40 * 10 ^ -6 / (1 * 10 ^ 3) = 40 nC (40 * 10 ^ -9 C).
Answer: The displaced charge is 40 nC.