A spherical surface completely surrounds a collection of charges. Find the electric flux through the surface if the collection consists of the following charges. (a) a single +4.10 10-6 C charge (b) a single -2.20 10-6 C charge (c) both of the charges in (a) and (b)
apply electric flux phi = Q/eo
Gauss law
a. when q = 4.1 e-6
fluxc = 4.1 e-6/(8.85e-12)
fluxc = 4.63 *10^5 Nm^2/C
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when Q = -2.2 e-6
flucx = 2.2 e-6/8.85e-12
flux = 2.48 *10^5
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when both charge
Qnet = 4.1-2.2 = 1.9 e-6
so flux = 1.9 e-6/(8.85e-12)
flux = 2.14 *10^5 Nm^2/C
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Gauss's law may be used
where ?E is the electric flux through a closed surface S enclosing any volume V, Q is the total charge enclosed within S, and ?0 is the electric constant.
then ,
a) flux = 4.10 10^-6 C/ ?0
Flux = 4.63*105 N.m^2/C
b)
flux = -2.2 10^-6 C/ ?0
Flux = -2.48*105 N.m^2/C
c)
flux =(4.1 -2.2) 10^-6 C/ ?0
Flux = 2.15*105 N.m^2/C
flux=Q/e0
(a)
Flux=4 x 10-6/8.85x10-12=4.52x105Vm
(b)
Flux=2.2 x 10-6/8.85x10-12=2.49x105Vm
(c)
Q=4-2.2=1.8x10-6C
Flux=1.8 x 10-6/8.85x10-12=2.03x105Vm
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