The correct answer is 200rN/C.
The area surrounding a charge or charged body where other charges (of lesser magnitude than the source charge) feel an electric force is known as the electric field.
Electric field intensities are utilized practically in electrical technology as well as being significant in many branches of science. On an atomic level, we may say that the attractive force that holds atoms together and the forces between atoms that result in chemical bonding are both caused by the electric field.
E=500r^2rN/C
electric field at r=20cm
r=0.2m
E=5000×0.2^2N/C
=200rN/C
diameter = 40cm
=r=20cm
thus r=0.2m
Electric flux Ф=E.A
area A = 4πr^2
=4π(0.2)^2
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