Question

The inward and outward electric flux from a closed surface are respectively 8 × 10³ and 4 × 10³ units. Then the net charge inside the closed surface is –

• A. – 4 × 10³ coulomb
• B. 4 × 10³ coulomb
• C. $\frac{–4 \times 10^{3}}{\varepsilon_{0}}$coulomb
• D. – 4 × 10³e₀ coulomb

Answer 1

Answer: (B)

4 × 10³ coulomb

Answer 2

f_net = E₀ (x + l) l² – E₀ xl² = E₀ l³

$\Sigma$q = (f_net) Ī₀