A 12pF capacitor is connected to a 50V battery. How much electrostatic energy is stored in the capacitor ?

(1) 1.5 × 10–8 Joule

(2) 2.5 × 10–7 Joule

(3) 3.5 × 10–5 Joule

(4) 4.5 × 10–2 Joule

Subtopic:  Energy stored in Capacitor |
 89%
From NCERT
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The capacity of a parallel plate condenser is 15 μF, when the distance between its plates is 6 cm. If the distance between the plates is reduced to 2 cm, then the capacity of this parallel plate condenser will be?

(1) 15 μF

(2) 30 μF

(3) 45 μF

(4) 60 μF

Subtopic:  Capacitance |
 85%
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The capacity of a parallel plate capacitor with no dielectric substance but with a separation of 0.4 cm is 2 μF. The separation is reduced to half and it is filled with a dielectric substance of value 2.8. The final capacity of the capacitor is 

(1) 11.2 μF

(2) 15.6 μF

(3) 19.2 μF

(4) 22.4 μF

Subtopic:  Dielectrics in Capacitors |
 81%
From NCERT
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Two insulated metallic spheres of 3 μF and 5 μF capacitances are charged to 300 V and 500V respectively. The energy loss, when they are connected by a wire is 

(1) 0.012 J

(2) 0.0218 J

(3) 0.0375 J

(4) 3.75 J

Subtopic:  Energy stored in Capacitor |
 71%
From NCERT
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A charge of 40 μC is given to a capacitor having capacitance C = 10 μF. The stored energy in ergs is 

(1) 80 × 10–6

(2) 800

(3) 80

(4) 8000

Subtopic:  Energy stored in Capacitor |
 51%
From NCERT
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A parallel plate capacitor has plate area A and separation d. It is charged to a potential difference V0. The charging battery is disconnected and the plates are pulled apart to three times the initial separation. The work required to separate the plates is 

(1) 3ε0AV02d

(2) ε0AV022d

(3) ε0AV023d

(4) ε0AV02d

Subtopic:  Energy stored in Capacitor |
From NCERT
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The electric field between the plates of a parallel plate capacitor when connected to a certain battery is E0. If the space between the plates of the capacitor is filled by introducing a material of dielectric constant K without disturbing the battery connections, the field between the plates shall be 

(1) K E0

(2) E0

(3) E0K

(4) None of the above

Subtopic:  Dielectrics in Capacitors |
From NCERT
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If the distance between parallel plates of a capacitor is halved and dielectric constant is doubled then the capacitance 

(1) Decreases two times

(2) Increases two times

(3) Increases four times

(4) Remain the same

Subtopic:  Dielectrics in Capacitors |
 85%
From NCERT
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If there are n capacitors each of capacitance C in parallel connected to V volt source, then the energy stored is equal to 

1. CV

2. 12nCV2

3. CV2

4. 12nCV2

Subtopic:  Energy stored in Capacitor |
 92%
From NCERT
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The unit of electric permittivity is 

(1) Volt/m2

(2) Joule/coulomb

(3) Farad/m

(4) Henry/m

Subtopic:  Capacitance |
 64%
From NCERT
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