1ya it was a very basic q i just liked it so post it ;)
charges Q1 &Q2 lies inside & outside respectively of a closed surface S.Let E be the field at any point on S &φ be flux of E over S
a)if Q1 changes ,bothE& φ will change
b)if Q2 changes ,E will change but φ will not change
c)if Q1=0& q2≠0 then E ≠0 but φ =0
d)if Q1≠0 & Q2≠0 then E=0 but φ ≠0
ans ABC
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3 Answers
33a) b) c)
as∫ E.ds=qinc/ε
E in LHS is field due to all charges...
so E changes due to both q1 and q2
but flux is only due to inclosed charge..