2- the following figure depicts these charges and a Gaussian surface. a. which c

Question

2- the following figure depicts these charges and a Gaussian surface. a. which charges contribute to the net flux through the Gaussian surface? explain! b. which of the charges contribute to the electric held at a given point on the surface? c. suppose that the net charge enclosed by some Gaussian surface is zero. does it follow that the electric field is zero at all points on the surface? d. is the reverse true (if the electric field is zero at all points on a surface, is the net charge enclosed zero?)

Explanation / Answer

a) here ,

Q1 and Q2 contribute to flux through the surface

as both charges are inside the gaussain surface ,

both charges contribute to the flux through the gaussian surface .

b)

here , all the three charges , Q 1 , Q2 , Q3 contribute to electric field at a given point

c)

No, even if the net fluxthrough the gaussian surface is zero ,

it does not mean the net field at every point is zero.

d)

Yes , this is true , as the flux is zero if electric field is zero at all points

and according to gauss law ,

net electric flux = charge enclosed inside /epsilon

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