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

Subtopic:  Capacitance |
From NCERT
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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

Subtopic:  Capacitance |
From NCERT
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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

Subtopic:  Combination of Capacitors |
From NCERT
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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

Subtopic:  Combination of Capacitors |
 51%
From NCERT
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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 rate of change of capacity depends on d as follows 

(1) 1/d

(2) 1/d2

(3) d2

(4) d

Subtopic:  Capacitance |
 54%
From NCERT
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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

Subtopic:  Energy stored in Capacitor |
 75%
From NCERT
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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

Subtopic:  Combination of Capacitors |
 76%
From NCERT
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The variation of potential with distance R from a fixed point is as shown below. The electric field at R = 5 m is 

(1) 2.5 volt/m

(2) –2.5 volt/m

(3) 2/5 volt/m

(4) –2/5 volt/m

Subtopic:  Relation between Field & Potential |
From NCERT
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The figure gives the electric potential V as a function of distance through five regions on x-axis. Which of the following is true for the electric field E in these regions 

(1) E1>E2>E3>E4>E5

(2) E1=E3=E5 and E2<E4

(3) E2=E4=E5 and E1<E3

(4) E1<E2<E3<E4<E5

Subtopic:  Relation between Field & Potential |
 74%
From NCERT
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In a hollow spherical shell potential (V) changes with respect to distance (r) from centre 

(1)

(2)

(3)

(4)

Subtopic:  Electric Potential |
 83%
From NCERT
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