Answer question on the basis of your understanding of the following paragraph and the related studied concepts.
A Charges placed at a point in space produces an electric field everywhere in the surrounding. When another charge is borught in the field of first charge, it experiences a force . The electric field at a point is space due to given charges is defind as the force that a unit positive charges would experience if placed at that point.
It we consider a system of charges `q_1, q-2,q_3 .....` with position vectors `oversetto (r_1 ) , oversetto (r_2) , oversetto (r_3) .....` relative to some origin O, then electric field at a point in space due to the system of charges is determined by finding the vector sum of fields due to all individual charges of the charges system.
A charges `q=-2 mu C ` is placed at a point O. Find the electric field at a point P situated at a distance 0.5 m from O along positive direction of x-axis.
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Explanation

Electric field at P, E = force experienced by a unit positive charged placed at p
` =(1)/( 4pi in _0) .(q)/(r^(2)) =((9xx 10^(9))xx ( -2xx 10 ^(-6))/( (0.5)^(2)) =-7.2 xx 10 ^(4) NC^(-1) `