Question: Q. 2. Calculate the amount of work done to dissociate a system of three charges $1 \mu \mathrm{C}, 1 \mu \mathrm{C}$ and $-4 \mu \mathrm{C}$ placed on the vertices of an equilateral triangle of side $10 \mathrm{~cm}$.
A [O.D. Comptt. I 2013]
Show Answer
Solution:
Ans. Given :
$$ \begin{aligned} q_{\mathrm{A}} & =1 \times 10^{-6} \mathrm{C}=q_{\mathrm{B}} \ q_{\mathrm{C}} & =-4 \times 10^{-6} \mathrm{C} \ r & =10 \mathrm{~cm}=0.1 \mathrm{~m} \end{aligned} $$
[CBSE Marking Scheme 2013]
AI Q. 3. Draw a plot showing the variation of (i) electric field $(E)$ and (ii) electric potential $(V)$ with distance $r$ due to a point charge $Q$.
U[Delhi I, II, III 2012]
Ans.
Detailed Answer :
Due to point charge :
Electric potential, $V=\frac{1}{4 \pi \varepsilon_{0}} \cdot \frac{Q}{r}$
Now on plotting electric field and electric potential with distance $r$
