Two pieces of plas- tic, a full ring and a half ring, have the same radius and charge density. which electric field at the center has the greater magnitude? discuss and defend your answer.

The magnitude of the Electric Field at the centre of both plastic would be equal to Zero {i.e E =0}

Explanation: A plastic either full circle or half is an insulator, and the charges in an insulator cannot move around.

Therefore, thier electric potential p(r) = 0.

Recall that,

Electric field intensity E = first derivative of p(r) with respect to r ( radius).since p(r) = 0, E = 0 inside both plastic.

mistakes are ok

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this