Q: Refer to the arrangement of charges in figure and a Gaussian surface of radius R with Q at the centre . Then ,
(a) Total flux through the surface of the sphere is $-\frac{Q}{\epsilon_0}$
(b) Field on the surface of the sphere is $-\frac{Q}{4 \pi \epsilon_0 R^2 }$
(c) Flux through the surface of sphere due to 5Q is zero
(d) Field on the surface of sphere due to -2Q is same everywhere
Ans: (a) & (c)