Final answer:
To find the distance from a charge where the electric field magnitude is 2.90 N/C, use Coulomb's law formula E = kQ/r^2 and solve for r, substituting the given values for the electric field and charge.
Step-by-step explanation:
The question concerns the calculation of electric field magnitude at a certain distance from a charge, which falls under the subject of Physics, tackled typically at a high school level. To calculate the distance at which the electric field (E) is equal to a specified value, given a point charge (Q), one can use Coulomb's Law and the formula E = kQ/r^2, where E is the electric field magnitude, k is Coulomb's constant (8.99 × 10^9 N·m^2/C^2), Q is the charge, and r is the distance from the charge. Solving for r when the electric field magnitude (E) is given, the formula becomes r = sqrt(kQ/E). With a given electric field magnitude of 2.90 N/C, you can substitute the known values to find the corresponding distance. For example, if the charge Q were 5.00 mC, which is 5.00 × 10^-3 C, you would rearrange the formula to solve for r and compute the value accordingly.