Electrostatic Force and Electric Field

Which one sketch correctly electric field strength on q2

Figure below shows the three point charges are placed in the shape of triangular.

Determine the direction of the resultant electric force exerted on q₁.

Which of the sketch are correct about electrostatic force, F and electric field strength, E?

Two point charges, Q₁ and Q₂ are placed 2.0 cm and 3.0 cm from the point A respectively as shown in figure below.

Find the direction of the electric field intensity at point A.

which one sketch correctly electric forces on q1?

What is the magnitude of the electric field at point P due to the two charges positioned as shown in the diagram below? $$8.2\ x\ 10^5$$  

Three point charges are placed at the following points on the x-axis: $$q_3\ =\ -5.0\ \mu C\ at\ x=120.0\ cm$$  

$$q_1\ =\ +2.0\ \mu C\ at\ x=0,$$  

$$q_2\ =\ -3.0\ \mu C\ at\ x\ =40.0\ cm,$$  

Find the amount of force acted on the $$q_3$$   charge.

A charge of $$q_1\ =+q$$  is located 1.5m to the right of point P. Where would you have to place a charge of $$q_2\ =+q$$   so the electric field at P would be zero?

Two charges are positioned as shown in the diagram below.

Find the magnitude and direction of the electric field at A.

 Figure below shows two charges $$+40\mu C$$   and $$-20\mu C$$   seperated by $$1.3\ m$$  . Determine the electric field at point D due to the negative charge.