Two point charges qA = 3 µC and qB = −3 µC are located 20 cm apart in vacuum. (a) What is the electric field at the midpoint O of the line AB joining the two charges? (b) If a negative test charge of magnitude 1.5 × 10−9 C is placed at this point, what is the force experienced by the test charge?

Question 8: Two point charges q A = 3 µC and q B = −3 µC are located 20 cm apart in vacuum. (a)    What is the electric field at ...