In an isolated parallel plate capacitor of capacitance C, the four surface have charges Q1, Q2, Q3 and Q4 as shown. The potential difference between the plates is 

(1) Q1+Q2+Q3+Q42C

(2) Q2+Q32C

(3) Q2Q32C

(4) Q1+Q42C

Concept Questions :-

Combination of capactiors
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For the circuit shown, which of the following statements is true 

(1) With S1 closed, V1 = 15 V, V2 = 20 V

(2) With S3 closed V1 = V2 = 25 V

(3) With S1 and S2 closed V1 = V2 = 0

(4) With S1 and S3 closed, V1 = 30 V, V2 = 20 V

Concept Questions :-

Combination of capactiors
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Consider the situation shown in the figure. The capacitor A has a charge q on it whereas B is uncharged. The charge appearing on the capacitor B a long time after the switch is closed is 

(1) Zero

(2) q/2

(3) q

(4) 2q

Concept Questions :-

Combination of capactiors
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A capacitor of capacitance C1 = 1 μF can withstand maximum voltage V1 = 6kV (kilo-volt) and another capacitor of capacitance C2 = 3 μF can withstand maximum voltage V2 = 4 kV. When the two capacitors are connected in series, the combined system can withstand a maximum voltage of

(1) 4 kV

(2) 6 kV

(3) 8 kV

(4) 10 kV

Concept Questions :-

Combination of capactiors
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In the given figure each plate of capacitance C has partial value of charge 

(1) CE

(2) CER1R2r

(3) CER2R2+r

(4) CER1R1r

Concept Questions :-

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The plates of a capacitor are charged to a potential difference of 320 volts and are then connected across a resistor. The potential difference across the capacitor decays exponentially with time. After 1 second the potential difference between the plates of the capacitor is 240 volts, then after 2 and 3 seconds the potential difference between the plates will be 

(1) 200 and 180 V

(2) 180 and 135 V

(3) 160 and 80 V

(4) 140 and 20 V

Concept Questions :-

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The plates of a parallel plate condenser are pulled apart with a velocity v. If at any instant their mutual distance of separation is d, then the magnitude of the time of rate of change of capacity depends on d as follows 

(1) 1/d

(2) 1/d2

(3) d2

(4) d

Concept Questions :-

Types of capactiors
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A fully charged capacitor has a capacitance ‘C’. It is discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat capacity ‘s’ and mass ‘m’. If the temperature of the block is raised by ‘ΔT’, the potential difference ‘V’ across the capacitance is 

(1) msΔTC

(2) 2msΔTC

(3) 2mCΔTs

(4) mCΔTs

Concept Questions :-

Energy stored in capacitor
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A network of four capacitors of capacity equal to C1=C,  C2=2C,C3=3C and C4 = 4 C are connected in a battery as shown in the figure. The ratio of the charges on C2 and C4 is 

(1) 223

(2) 322

(3) 74

(4) 47

Concept Questions :-

Combination of capactiors
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A 4 μF capacitor, a resistance of 2.5 MΩ is in series with 12 V battery. Find the time after which the potential difference across the capacitor is 3 times the potential difference across the resistor. [Given ln(2)= 0.693] 

(1) 13.86 s

(2) 6.93 s

(3) 7 s

(4) 14 s

Concept Questions :-

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