EWT | Academic Question

Questions
Question (1)
QN0038919

On decreasing the distance between the plates of a parallel plate capacitor, its capacitance 

  • (A)

    remains unaffected

  • (B)

    decreases

  • (C)

    first increases then decreases.

  • (D)

    increases

Correct Answer: D
Explanation:

Since capacitance , as d decreases capacitance increases.

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Question (2)
QN0038920

If in a parallel plate capacitor, which is connected to a battery, we fill dielectrics in whole space of its plates, then which of the following increases?              

  • (A)

    Q and V

  • (B)

    V and E

  • (C)

    E and C

  • (D)

    Q and C

Correct Answer: D
Explanation:

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Question (3)
QN0038921

When air in a capacitor is replaced by a medium of dielectric constant , the capacity    

  • (A)

    decreases  times

  • (B)

    increases  times

  • (C)

    increases  times

  • (D)

    remains constant

Correct Answer: B
Explanation:

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Question (4)
QN0038922

A parallel plate capacitor with air between the plates has a capacitance of . Calculate the capacitance if the distance between the plates is reduced by half and the space between them is filled with a substance of dielectric constant. 

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: D
Explanation:

Capacity of parallel plate capacitor

So,

If  and  then new capacitance

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