Part A) If a parallel plate capacitor with capacitance C has twice the magnitude

Question

Part A)

If a parallel plate capacitor with capacitance C has twice the magnitude of charge on its plates than another with capacitance C , while having the same potential difference across its plates, what is the relation between C and C ?

D) C=C/2

Part B

what if instead it has three times the potential difference across its plate, while having the same magnitude of charge on its plates?

A) C'=2C

B) C'=C/3

C) C'=C/2

D) C'=3C

D) C=C/2

Part B

what if instead it has three times the potential difference across its plate, while having the same magnitude of charge on its plates?

A) C'=2C

B) C'=C/3

C) C'=C/2

D) C'=3C

Explanation / Answer

V = Q / C

2 Q / C' = Q / C

C' =2 C

Ans(B)

----------------------------

Q = C V

C' V' = C V and V' = 3 V

C' = C / 3

Ans(B)

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