1.

Find the fluz f the electric field through a spherical surface of radius R due to a charge of 10^(-7) Cat the centre and anotherequal charge at a point 2R away from the centre (figure ).

Answer»

Solution :Given: MAGNITUDE of the TWO charges
placed = `( 10^-7)C`
We know from Gauss's law that the FLUX
experience by the sphere is only by due
to internal CHARGE and not by the external
ONE.
Now,
` E xx ds = (Q/epsilon_0) = (10^-7)/ 8.85 xx (10^+12)`
` = 1.1 xx (10^4) N-m/C.`


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