Two curved plastic rods are shaped into semicircles and together they form a circle. the rod on top has a uniform charge distribution of +4q and bottom rod has a charge of -2q. what is the net electric field at the center of the circle?

Explanation:

Given that

Top rod have +4Q charge

Bottom tube have -2Q charge

We know that electric filed due to half ring on the center given as

Where

λ is the charge per unit length

K is the constant

R is the radius of ring

For top rod

λ=+4Q/πR

So

For bottom ring

So the total resultant electric field at the center= E-E'

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