Electrostatics 5 Question 37
39. Two capacitors $C _1$ and $C _2$ are charged to $120 V$ and $200 V$ respectively. It is found that by connecting them together the potential on each one can be made zero. Then
(2013 Main)
(a) $5 C _1=3 C _2$
(c) $3 C _1+5 C _2=0$
(b) $3 C _1=5 C _2$
(d) $9 C _1=4 C _2$
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Solution:
- Polarity should be mentioned in the question. Potential on each of them can be zero if, $q _{\text {net }}=0$
$$ \text { or } \quad q _1 \pm q _2=0 $$
or $\quad 120 C _1 \pm 200 C _2=0$ or $3 C _1 \pm 5 C _2=0$
