Physics
posted by Monica .
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 nearﬁeld 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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