1. You need two capacitors of magnitude 0.8 F and 5.0 F. In your stock, you have
ID: 1436382 • Letter: 1
Question
1. You need two capacitors of magnitude 0.8 F and 5.0 F. In your stock, you have ONLY four capacitors, C1=1F, C2 = 2 F, C3 = 3 F and C4 = 4 F. Try if you can make the needed capacitors using appropriate connections.
2. A parallel plate capacitor with plates of area A and plate separation d is charged so that the potential difference between its plates is V. If the capacitor is then isolated and its plate separation is decreased to d/2, what happens to its capacitance?
A) The capacitance is twice its original value.
B) The capacitance is four times its original value.
C) The capacitance is eight times its original value.
D) The capacitance is one half of its original value
E) The capacitance is unchanged.
3. The magnitude of the charge on the plates of an isolated parallel plate capacitor is doubled. Which one of the following statements is true concerning the capacitance of this parallel-plate system?
A) The capacitance is decreased to one half of its original value.
B) The capacitance is increased to twice its original value.
C) The capacitance remains unchanged.
D) The capacitance depends on the electric field between the plates.
E) The capacitance depends on the potential difference across the plates.
Explanation / Answer
1.
If we attach C1 and C4 in series, their equivalnt capacitance be C'
C' = C1*C4 / (C1+C4)
= 1*4/ (1+4)
= 0.8
Thus to get 0.8 F capacitor add C1 and C4 in series
-------------------------------------
to get 5 F add C4 and C1 in parallel
Cnet = C1+C4 = 1+ 4 = 5 F
2.
C = (ebsoleneo*A/d)
when d is decreased ,
C gets doubled
Answer: A
3.
C = (ebsoleneo*A/d)
It doesn't depend on charge
Answer: C
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