- #1
chopnhack
- 53
- 3
Homework Statement
2.75 mC is uniformly distributed on a ring of radius 8.5 cm. Find the electric field on the axis at (a) 1.2
cm, (b) 3.6 cm and (c) 4.0 m from the center of the ring.
Homework Equations
[/B]
E = (kQx)/(a^2+x^2)^(3/2)
3. The Attempt at a Solution
This question really boils down to a calculator issue, operator error issue or the abyss of unknown. When I perform the calculation on two different calculators using different methods, including a graphing calculator that has memory allowing me to repeat an equation previously used and change its variables, I get a strange answer for the second part 3.6cm. It ends up larger by one order! It can't be because its further from the charge, but each time I calculate it I get an erroneous value.
a) 4.695 x 10^5 N/C
b) 1.13 x 10^6 N/C
c) 1.54 x 10^3 N/C
Please don't say throw out the calculator because I checked it with a 30 year old Sharp 531D and I get the same results! I must be missing something. Anyone able to assist? Most appreciated, thanks!