NCERT Exercise 1.16 - Electric Charges and Fields
Question: Careful measurement of the electric field at the surface of a black box indicates that the net outward flux through the surface of the box is 8.0 × 10³ Nm²/C. (a) What is the net charge inside the box? (b) If the net outward flux through the surface of the box were zero, could you conclude that there were no charges inside the box? Why or why not?
Answer: (a) Net charge inside the box = **q = ε₀Φ = 8.854×10⁻¹² × 8.0×10³ ≈ 70.8 × 10⁻⁹ C ≈ 70.8 nC**. (b) **No**, we cannot conclude there are no charges. Zero net flux means zero net charge (positive and...
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