Charges `Q_1 and Q_2` lie inside and outside, respectively, of a closed surface S. Let E be the field at any point on S and `phi` be the flux of E over S.

Options

A. If `Q_1` changes both E and `phi` will change
B. If `Q_2` changes, will changes but `phi` will not change
C. If `Q_1=0` and `Q_2!=0`, then `E!=0` but `phi=0`
D. If `Q_1!=0` and `Q_2=0,` the `E=0` but `phi !=0`

Answer

A, B, C

Explanation

electric fiekld at an point depends on both chares `Q_1` and `Q_2` But electric flux passing from any closed surface depends on the charged enclosed by that closed surface only