(a) Calculate the electric field (magnitude and direction) at a distance of 30cm

Question

(a) Calculate the electric field (magnitude and direction) at a distance of 30cm from a point charge q1 = 5 × 109 C.

(b) Calculate the force on a charge q2 = 4 × 109C placed 30cm from q1.

(c) Calculate the force on a charge q3 = 4 × 109C placed 30cm from q1 (in the absence of q2).

This is the part I most need help with, but you need the info in the above parts to do it: Sketch the electric field of the collection of charges described in #2. Briefly justify your sketch above, below, left, right, and between the charges.

Explanation / Answer

A) electric field at r = 30 cm = 0.30 m

E = kq1/r^2 = 8.98*10^9*5*10^-9/(0.30)^2 = 498.88 N/C

B) F = q2 * E = 4*10^-9*498.88 = 19.95*10^-7 N ....REPULSIVE

B) F = 19.95*10^-7 N ....ATTRACTIVE

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