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

(1) CE

(2) CER1R2r

(3) CER2R2+r

(4) CER1R1r

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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

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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

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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

Concept Questions :-

Relation between field and potential
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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

Concept Questions :-

Relation between field and potential
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In a hollow spherical shell potential (V) changes with respect to distance (r) from centre 

(1)

(2)

(3)

(4)

Concept Questions :-

Electric potential
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What physical quantities may X and Y represent ? (Y represents the first mentioned quantity) 

(1) Pressure v/s temperature of a given gas (constant volume)

(2) Kinetic energy v/s velocity of a particle

(3) Capacitance v/s charge to give a constant potential

(4) Potential v/s capacitance to give a constant charge

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