Question

Two charged particles $+5\mu C$ and $+10\mu C$ are placed $20cm$ apart. Find the electric field at the midpoint between the two charges.

• A. $4.5mN/C$
• B. $4.5MN/C$
• C. $4.5kN/C$
• D. $4.5GN/C$

Answer 1

The correct option is B $4.5MN/C$

$x=\frac{r}{2}=\frac{0.2}{2}=0.1m$

$E_{net}=E_2-E_1$

$⟹E_{net}=\frac{k{q}_2}{x^2}-\frac{k{q}_1}{x^2}$

$E_{net}=\frac{9\times {10}^9}{0.01}(10-5)\times {10}^{-6}$

$⟹E_{net}=4.5\times {10}^{6}N/C$

$⟹E_{net}=4.5MN/C$

Answer-(B)