Can someone please help me. I only have one attempt left and I just dont underst

Question

Can someone please help me. I only have one attempt left and I just dont understand what I am doing wrong here...This is so overwhelming :(

A uniformly charged ring of radius 10.0 cm has a total charge of 88.0 C. Find the electric field on the axis of the ring at the following distances from the center of the ring. (Choose the x-axis to point along the axis of the ring.) (a) 1.00 cm 7.79e6X what is the general expression for the electric field along the axis of a uniformly charged ring? MN/C (b) 5.00 cm 2.83e7 X 2837x What is the general expression for the electric field along the axis of a uniformly charged ring? i MN/C eld along the axis of a uniformly charged ring? 1 MIN/C (c) 30.0 cm 7.50e6 Note that the charge on the ring is given in units ofIC and the answer is given in MNC = 106 NC i MNC (d) 100 cm 7.79e5X What is the general expression for the electric field along the axis of a uniformly charged ring? i MN/C

Explanation / Answer

E =[ K*x*q / (x^2 + r^2)^3/2]*i(cap)

a)

r = 10 cm = 0.10 m

x = 1 cm = 0.01 m

Ea = (9 x 10^9 x 0.01 x 88 x 10^-6) / (0.01^2 + 0.10^2)^3/2

Ea = 7920 / 0.00101

Ea = 7.84 x 10^6 N/C

2)

r = 10 cm = 0.10 m

x = 5 cm = 0.05 m

Eb = (9 x 10^9 x 0.05 x 88 x 10^-6) / (0.05^2 + 0.10^2)^3/2

Eb = 39600 / 0.001398

Eb = 2.83 x 10^7 N/C

3)

r = 10 cm = 0.10 m

x = 30 cm = 0.3 m

Ec = (9 x 10^9 x 0.3 x 88 x 10^-6) / (0.3^2 + 0.10^2)^3/2

Ec = 237600 / 0.03162

Ec = 7.51 x 10^6 N/C

d)

r = 10 cm = 0.10 m

x = 100 cm = 1 m

Ed = (9 x 10^9 x 1 x 88 x 10^-6) / (1^2 + 0.10^2)^3/2

Ed = 792000 / 1.015

Ed = 7.80 x 10^5 N/C

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