PLEASE HELP! Electric Field 3 inline charges.
Referring to the diagram above.

if Q1 = 9.0 uC, Q2 = -3.0 uC and Q3 = 26.0 uc,
what is the magnitude of the electric field at Q2, due to Q1 and Q3?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.