The formula is E = kQ/r^2, where E is the electric field, k is Coulomb's constant (9 x 10^9 Nm^2/C^2), Q is the charge, and r is the distance from the charge.
In this case, Q = 33 nC = 33 x 10^-9 C (since 1 nC = 10^-9 C) and r = 20 cm = 0.2 m (since 1 cm = 0.01
Show more…