Home
Class 12
PHYSICS
A parallel plate capacitor having a plat...

A parallel plate capacitor having a plate separation of `2mm` is charged by connecting it to a `300V` supply. The energy density is

A

`0.01 J//m^3`

B

`0.1 J//m^3`

C

`1.0 J//m^3`

D

`10 J//m^3`

Text Solution

Verified by Experts

The correct Answer is:
B
Energy density –
`U=1/2 epsilon_0E^2 =1/2 epsilon_0 (V/d)^2`
`=1/2 xx8.85 xx10^(-12)xx((300)/(2xx10^(-3)))^2`
`=9.95 xx10^(-2) J//m^3 =10xx10^(-2) J//m^3 =0.1 J//m^3`
Promotional Banner

Topper's Solved these Questions

  • ELECTROSTATICS

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Grouping of Capacitors)|58 Videos

  • ELECTROSTATICS

    ERRORLESS|Exercise PAST YEARS QUESTIONS|56 Videos

  • ELECTROSTATICS

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Electric Flux and Gauss.s Law)|27 Videos

  • ELECTRONICS

    ERRORLESS|Exercise Assertion & Reason|26 Videos

  • MAGNETIC EFFECTS OF CURRENT

    ERRORLESS|Exercise ASSERTION & REASON |18 Videos

Similar Questions

Explore conceptually related problems

The plates of a parallel plate capacitor have an area of 90cm^(2) and each are separated by 2mm. The capacitor is charged by connecting it to a 400 V supply. Then the energy density of the energy stored (in Jm^(-3) ) in the capacitor is (take epsi_(0)=8.8xx10^(-12)Fm^(-1) )

A parallel plate capacitor having plate area A and separation between the plates d is charged to potential V .The energy stored in capacitor is ....???

A 5.80 muF parallel-plate air capacitor has a plate separation of 5.00 mm and is charged to a potential difference of 400 V . Calculate the energy density in the region between the plates, in J/m^3

The plates of a parallel plate capacitor have an area of 90cm^(2) each and are separated by a 2mm The capacitor is charged by connecting it to a 400V supply.Then the density of the energy stored in the capacitor ..........?

A parallel plate capacitor of plate are A and plate separation d is charged by a battery of voltage V. The battery is then disconnected. The work needed to pull the plates to a separation 2d is

A pararllel plate capacitor has plates of area A and separation d and is charged to potential diference V . The charging battery is then disconnected and the plates are pulle apart until their separation is 2d . What is the work required to separate the plates?

A parallel plate capacitor is charged. If the plates are pulled apart

A parallel plate capacitor of plate area (1xx3) m^(2) and plate separation 5.0 mm is charged to 10 kV in air. Find charge density and field displacement.

An electric dipole of dipole moment 2xx10^(-10) coulomb is placed between parallel plate capacitor (see figure) having plate separation 2 cm and charged upto 100 V. Potential energy of the dipole will be -

ERRORLESS-ELECTROSTATICS-NCERT BASED QUESTIONS (Capacitance)
  1. Two metallic spheres of radii 1 cm and 2 cm are given charges 10^(-2) ...

    Text Solution

    |

  2. A variable condenser is permanently connect to a 100V battery. If the ...

    Text Solution

    |

  3. A parallel plate capacitor having a plate separation of 2mm is charged...

    Text Solution

    |

  4. A capacitor is used to store 24 watt hour of enegy at 1200 volt. What ...

    Text Solution

    |

  5. A charge of 40 mu C is given to a capacitor having capaci...

    Text Solution

    |

  6. The electric field between the plates of a parallel plate capacitor is...

    Text Solution

    |

  7. If the distance between the plates of parallel plate capacitor is halv...

    Text Solution

    |

  8. A parallel plate capacitor of capacity C(0) is charged to a potential ...

    Text Solution

    |

  9. A capacitor of capacitance C(0) is charged to a potential V(0) and is ...

    Text Solution

    |

  10. A parallel plate capacitor has an electric field of 10^(5)V//m between...

    Text Solution

    |

  11. The capacitance of a metallic sphere will be 1muF, if its radius is ne...

    Text Solution

    |

  12. Two conducting spheres of radii r(1) and r(2) having charges Q(1) and ...

    Text Solution

    |

  13. A cylindrical capacitor has charge Q and length L. If both the charge ...

    Text Solution

    |

  14. Conducting sphere of radius R(1) is covered by concentric sphere of ra...

    Text Solution

    |

  15. Two spherical conductors A and B of radii a and b (b gt a) are placed ...

    Text Solution

    |

  16. A capacitor is charged by using a battery which is then disconnected. ...

    Text Solution

    |

  17. A parallel plate capacitor is charged and the charging battery is then...

    Text Solution

    |

  18. A system is shown in the figure. The time period for small oscillation...

    Text Solution

    |

  19. A parallel plate capacitor is charged by connecting it to a battery. T...

    Text Solution

    |

  20. An uncharged capacitor is connected to a battery. On charging the capa...

    Text Solution

    |