Question

four point charges -2q,-q,+q ,+2q are placed at the corner a,b,c and of a square of side 2cm. find the magntude and direction of the electric field at the center of the square 0.02 micro coulamb

Answer 1

Consider that there is a point Charge at the center so that you can find the forces acting on it

Remember that point charges are always positive

Pls Refer the attachment for the answer

I hope this helps ( ╹▽╹ )

Answer 2

Then Denominator=2x+1

Fraction =2x+1x

Reciprocal of the fraction =x2x+1

It is given that the sum fo the fraction and its reciprocal is 22116

∴2x+1x+x2x+1=22116

⇒x(2x+1)x2+(2x+1)2=2158⇒2x2+x5x2+4x+1=2158

⇒21(5x2+4x+1)=58(2x2+x)⇒105x2+84x+21=116x

⇒11x2−26x−21=0⇒11x2−33x+7x−21=0⇒11x(x−3)+7(x−3)=0

⇒(11x+7)(x−3)=0⇒x=3,−117

∵ x can not be a negative 

⇒x=3