1.

Refer to the arrangement of charges in shown figure and a Gaussian surface of radius R with Q at the centre. Then:

Answer»

total flux through the surface of the sphere is `(-Q)/(4piepsilon_(0)R^(2))`
field on the surface of the sphere is
flux through the surface of sphere DUE to 5Q is zero.
field on the surface of sphere due to -2Q is same everywhere.

Solution :Charge enlosed by sphere,
`=-2Q +Q`
`=-Q`
`therefore` flux associated with flux,
`phi = -Q/epsilon_(0)` (`therefore` According to Gauss.s law)
As SQ is outside, it doesn.tplay any role in flux.


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