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.
