Physics

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Consider a disk of radius 2.6 cm with a uniformly distributed charge of +3.6 µC. Compute the magnitude of the electric field at a point on the axis and 3.3 mm from the center. The value of the Coulomb constant is 8.98755 × 10^9 Nm2/C2.
Answer in units of N/C

Compute the field from the near-field approximation x ≪ R .
Answer in units of N/C

Compute the electric field at a point on the axis and 31 cm from the center of the disk.
Answer in units of N/C

Approximate the field by treating the disk as a +3.6 µC point charge at a distance of 31 cm.
Answer in units of N/C


This is what I know so far:
E=F/q=kQ/r^2

I started with E=(8.98755*10^-6)/(.0033 m)^2
E=2.97*10^9 N/C

I feel like I am missing a step. I know I use this idea though.

HELP! Thanks!

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