Question

Find the Total force of q3 were the charges of difference location is q1=3nC, q2 =4nC,and q3=5nC at corner of an equalateral triangle with the side of 10 cm find the a total force on q3 and Total electric field

Answer 1

$F_1=\frac{kq_1q_3}{r^2},$ $F_2=\frac{kq_2q_3}{r^2},$

$F=\sqrt{F_1^2+F_2^2-2F_1F_2cos 60°}=\frac{kq_3}{r^2}\sqrt{q_1^2+q_2^2-2q_1q_2cos60°},$

$F=16.2~\mu N;$

$E=\frac{F}{q_3},$

$E=3.2~\frac{kN}{C}.$