The three spherical Gaussian surfaces above each enclose a charge +Q o . In case

Question

The three spherical Gaussian surfaces above each enclose a charge +Qo.  In case C there is another charge –6Qooutside the surface. Rank the three cases above according to the magnitude of the net flux through the Gaussian surface in each case from highest to lowest.

Note on the ranking: If two items are equivalent, ranking is done in the same way as it is done for sports events. Say that there are two first places, then the ranking is "1 1 3 4 5 6". For three second places, the correct ranking is "1 2 2 2 5 6"

Explanation / Answer

gauss law

The net flux through any closed surface is equal to 1/eo times the charge present inside the surface

flux = Qinside/eo

case A

fluxA = Qo/eo

case B

fluxB = Qo/eo

case c

fluxc = Qo/eo

all the surfaces ar having the same net flux

fluxA = flux B = flux c

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