Electrostatic Potential and Capacitance - Result Question 40

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42. The capacity of a parallel plate condenser is $10 \mu F$ when the distance between its plates is $8 cm$. If the distance between the plates is reduced to $4 cm$ then the capacity of this parallel plate condenser will be

======= ####42. The capacity of a parallel plate condenser is $10 \mu F$ when the distance between its plates is $8 cm$. If the distance between the plates is reduced to $4 cm$ then the capacity of this parallel plate condenser will be

3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed:content/english/neet-pyq-chapterwise/physics/electrostatic-potential-and-capacitance/electrostatic-potential-and-capacitance—result-question-40.md (a) $5 \mu F$

(b) $10 \mu F$

(c) $20 \mu F$

(d) $40 \mu F$

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Answer:

Correct Answer: 42. (c)

Solution:

  1. (c) $C=10 \mu F \quad d=8 cm$

$C^{\prime}=? \quad d^{\prime}=4 cm$

$C=\frac{A \epsilon_0}{d} \Rightarrow C \propto \frac{1}{d}$

If $d$ is halved then $C$ will be doubled.

Hence, $C^{\prime}=2 C=2 \times 10 \mu F=20 \mu F$