Home
Class 12
PHYSICS
In the figure a capacitor of capacitance...

In the figure a capacitor of capacitance `2muF` is connected to a cell of emf 20 volt. The plates of the capacitor are drawn apart slowly to double the distance between them. The work done by the external agent on the plates is:

A

`-200muJ`

B

`200 muJ`

C

`400muJ`

D

`-400`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • CAPACITORS

    AAKASH SERIES|Exercise ADDITIONAL PRACTICE EXERCISE (LEVEL - II LECTURE SHEET (ADVANCED))(Straight Objective Type Questions)|9 Videos

  • CAPACITORS

    AAKASH SERIES|Exercise ADDITIONAL PRACTICE EXERCISE (LEVEL - II LECTURE SHEET (ADVANCED))(Matrix Matching Type Questions)|1 Videos

  • CAPACITORS

    AAKASH SERIES|Exercise PRACTICE SHEET (EXERCISE - IV) (LEVEL - II (ADVANCED) (More than one correct answer Type Questions)|4 Videos

  • ATOMS

    AAKASH SERIES|Exercise PRACTICE EXERCISE|21 Videos

  • COMMUNICATION SYSTEM

    AAKASH SERIES|Exercise LECTURE SHEET (LEVEL - I) (MAIN) (EXERCISE - IV) (Straight Objective & More than one Correct Answer Type Questions)|20 Videos

Similar Questions

Explore conceptually related problems

A capacitor having capacity of 2 muF is charged to 200 V and then the plates of the capacitor are connected to a resistance wire. The heat produced in joule will be

The plates of a parallel plate capacitor have surface area .A. and are initially separated by a distance .d.. They are connected to a battery of voltage v_0 Now, the plates of the capacitor are pulled apart w a separation 2d. Then, increase in the energy of the battery is

A parallel plate capacitor of capacitance 10 muF is connected across a battery of emf 5 mV. Now, the space between the plates of the capacitors is filled with a deielectric material of dielectric constant K=5. Then, the charge that will flow through the battery till equilibrium is reached is

Six equal capacitors each of capacitance 10muF are connect as shown in the figure. Then the equivalent capacitance between A and B is

A parallel plate capacitor of capacitance 10muF is connected to a cell of emf 10 V and is fully charged. Now a dielectric slab (k = 3) of thickness equal to the gap between the plates is completely filled in the gap, keeping the cell connected. During the filling process,

A parallel plate capacitor of capacitance 90 pF is connected to a battery of emf 20 V. If a dielectric material of dielectric constant K= (5)/(3) is inserted between the plates, the magnitude of the induced charge will be :

A parallel plate air capacitor is connected to a battery. If the plates of the capacitor are pulled farther apart, then state whether the following statements are true or false. a. Strength of the electric field inside the capacitor remains unchanged, if the battery is disconnected before pulling the plates. b. During the process, work is done by the external force applied to pull the plates irrespective of whether the battery is disconnected or not. c. Strain energy in the capacitor decreases if the battery remains connected. .

A capacitor of capacitance 5muF is charged to a potential difference 100V and then diconnected from the powerr supply. The minimum work needed to pull the plates of the capacitor apart so that the distance between them doubles is (in mJ).

A capacitor (C=50 muF) is charged to a potential difference of 20V . The charging battery is disconnected and the capacitor is connected to another cell of emf 10V with the positive plate of capacitor joined with the positive terminal of cell. (a) find charge flown through 10V cell. (b) is work done by the cell ot is it done on the cell? find its magnitude. (c) find the heat developed in connecting wires.

AAKASH SERIES-CAPACITORS -ADDITIONAL PRACTICE EXERCISE (LEVEL - I (MAIN)(Straight Objective Type Questions)
  1. Three uncharged capacitors are connected across a battery as shown. It...

    Text Solution

    |

  2. The ratio between masses of two planets is 3 : 5 and the ratio between...

    Text Solution

    |

  3. If the area of each plate is A and then successive separations are d, ...

    Text Solution

    |

  4. The capacitor shown has square plates of side L and has gap d between ...

    Text Solution

    |

  5. Three large plates are arranged as shown. How much charge will flow th...

    Text Solution

    |

  6. In the circuit shown in figure charge stored in the capacitor of capac...

    Text Solution

    |

  7. Capacitor C1 is connected to a battery and charged till the magnitude ...

    Text Solution

    |

  8. When switch is closed , charges on C(1) and C(2) are

    Text Solution

    |

  9. The plates of a parallel plate capacitor have surface area .A. and are...

    Text Solution

    |

  10. Figure shows two identical parallel plate capacitors connected to a sw...

    Text Solution

    |

  11. In the given circuit, the potential difference across the 6muF capaci...

    Text Solution

    |

  12. In the given circuit find the |V(A) - V(B)| where V(A), V(B) are ele...

    Text Solution

    |

  13. Figure shows two identical parallel plate capacitors connected to a sw...

    Text Solution

    |

  14. Arrange the folloowing in decreasing order effective capacitor between...

    Text Solution

    |

  15. In the accompanying diagram , if C(1)=3muF,C(2)=6muF,C(3)=9muF,C(4)=12...

    Text Solution

    |

  16. Consider a capacitor as shown in figure. If we pull the plates of capa...

    Text Solution

    |

  17. An isolated capacitor of capacitance C is charged to a potential V. Th...

    Text Solution

    |

  18. then P and Q are respectively called as.

    Text Solution

    |

  19. Four capacitors are connected as shown in figure. Their capacities are...

    Text Solution

    |

  20. In the figure a capacitor of capacitance 2muF is connected to a cell ...

    Text Solution

    |