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Question

Assertion: If the distance between parallel plates of a capacitor is halved and dielectric constant is three times, then the capacitance becomes 6 times.
Reason : Capacity of the capacitor does not depend upon the nature of the material.


A
If both assertion and reason are true but the reason is the correct explanation of assertion.
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B
If both assertion and reason are true but the reason is not the correct explanation of assertion.
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C
If assertion is true but reason is false.
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D
If both the assertion and reason are false.
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E
If reason is true but assertion is false.
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Solution

The correct option is C If assertion is true but reason is false.
We know that capacity of capacitor is directly proportional to dielectric constant and inversely proportional to distance. So, the net effect of making distance halved & making dielectric constant three times will be capacity becoming six times.
As nature of the material (dielectric constant) is a factor influencing the capacity, therefore, reason is false.

Physics

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