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The magnitude of the electric field E→ in the annular region of charged cylindrical capacitor
 

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Important Questions on Capacitance and Capacitors

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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 44
A parallel plate capacitor of plate area A and plate separation d is charged to potential difference V and then the battery is disconnected. A slab of dielectric constant K is then inserted between the plates of the capacitor so as to fill the space between the plates. If Q, E and W denotes respectively the magnitude of charge on each plate, the electric field between the plates (after the slab is inserted) and work done on the system, in question, in the process of inserting the slab, then which of the following statement is wrong ?
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12th West Bengal Board
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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 45
If the plates of the capacitor are moved further apart by means of insulating handles. A parallel plate capacitor is charged and the charging battery is then disconnected.
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12th West Bengal Board
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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 46
Two parallel plate capacitors of capacitance C and 2C are connected in parallel and charged to a potential difference V by the battery. The battery is then disconnected and the space between the plates of capacitor of capacitance C is completely filled with a material of dielectric constant K. The potential difference across the capacitors now becomes
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12th West Bengal Board
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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 47
A parallel plate capacitor of value1.77μF is to be designed using a dielectric material (dielectric constant 200, breaking strength of 3×106Vm-1.  In order to make such a capacitor, which can withstand a potential difference of 20 V Across the plates, the separation d Between the plates and the area A of the plates can be ε0=8.85×10-12C2 N-1 m-2
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12th West Bengal Board
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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 48

A parallel plate capacitor of capacitance C is connected to a battery and is charged to a potential difference V. Another capacitor of capacitance 2C is similarly charged to a potential difference 2V. The charging battery is now disconnected and the capacitors are connected in parallel to each other in such a way that the positive terminal of one is connected to the negative terminal of the other. The final energy of the configuration is:

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12th West Bengal Board
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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 49

For the circuit shown in figure, which of the following statements is true ?

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12th West Bengal Board
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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 50
 A parallel plate capacitor of area A, plate separation d and capacitance C is filled with three different dielectric materials having dielectric constants k1,k2 and k3 as shown in figure. If a single dielectric material is to be used to have the same capacitance C in this capacitor, then the dielectric constant k is given by 

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12th West Bengal Board
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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 51

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

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