Answer to Question #324573 in Electric Circuits for hazel

Question

(a) Find the net electrostatic force at sphere B. (b) Find the net electric field at (4,-3)

Answer 1

Electrostatic force

$F_B=\frac{kq_Aq_B}{r^2}$

$R=\sqrt{4^2+(-3)^2}=5m$

$F_B=\frac{kq_Aq_B}{5^2}=\frac{kq_Aq_B}{25}$

$E_A=\frac{F_B}{q_B}=\frac{kq_A}{5^2}=\frac{kq_A}{25}$