(a) What is the electric field at the origin? N/C j (b) What would be the force
ID: 2124671 • Letter: #
Question
(a) What is the electric field at the origin?
N/C j
(b) What would be the force on a charge of -4 nC placed at the origin?
N j
(c) If this force is due to a charge on the y axis at y = 3 cm, what is the value of that charge?
nC
Please give exact number answers to a,b,c
When a test charge q0 = 11 nC is placed at the origin, it experiences a force of 8 times 10-4 N in the positive y direction. What is the electric field at the origin? What would be the force on a charge of -4 nC placed at the origin? If this force is due to a charge on the y axis at y = 3 cm, what is the value of that charge?Explanation / Answer
a) E = F/q = 8.0E-4/11.0E-9=72727 N/C
b) F = qE = -4.0E-9*72727=2.91E-4 N
c) E = kq/r^2
q = 72727*4.0E-2^2/9E9=1.29E-8 C = 12.9 nC
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