Careful measurements of the electric field at the surface of a box inidcates that the net outward flux through the surface of box is `60xx10^(3) Nm^(2) C^(-1)`. Find (i) the net charge inside the box ? (ii) If the net outward flux through the surface of box were zero, could you conclude that there were no charges inside the box ? Explain your answer.

Careful measurements of the electric field at the surface of a box ini

1.	Careful measurements of the electric field at the surface of a box inidcates that the net outward flux through the surface of box is `60xx10^(3) Nm^(2) C^(-1)`. Find (i) the net charge inside the box ? (ii) If the net outward flux through the surface of box were zero, could you conclude that there were no charges inside the box ? Explain your answer.
Answer» (i) Here, `phi_(E) = 16xx10^(3) Nm^(2) C^(-1)` Acc. To Gauss theorem `phi_(E) = (q)/(in_(0))` So `q = phi_(E) xx in_(0) = 16xx10^(3) xx8.85xx10^(-12)` `= 0.14xx10^(-6) C = 0.14 muC` (ii) No, we can not say that there are no charges at all inside the box. We can only say that algebraic sum of charges inside the box is zero.

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