Home
Class 12
PHYSICS
An oil drop of 12 excess electrons is he...

An oil drop of 12 excess electrons is held stationary under a constant electric field of `2.55xx10^(4)NC^(-1)` in Millikan's oil drop experiment. The density of the oil is `1.26xx10^(3)kgm^(-3)`. Estimate the radius of the drop `(g=9.81ms^(-2),e=1.60xx10^(-19)C)`.

Promotional Banner

Topper's Solved these Questions

  • SUPER MODEL QUESTION PAPER ( WITH ANSWERS )

    SUBHASH PUBLICATION|Exercise PART C|23 Videos

  • SEMICONDUCTOR ELECTRONICS

    SUBHASH PUBLICATION|Exercise OPTIONAL NUMERICALS WITH SOLUTIONS|6 Videos

  • SUPER MODEL QUESTION PAPER 1

    SUBHASH PUBLICATION|Exercise QUESTION|37 Videos

Similar Questions

Explore conceptually related problems

In the uniform electric field of E = 1 xx 10^(4) NC^(-1) an electron is accelerated from rest . The velocity of the electron when it has travelled a distance of 2 xx 10^(-2) m is nearly … ms^(-1) ( e/m of electron = 1.8 xx 10^(11) C kg^(-1) )

A current of 2 A is passing through a metal wire of cross sectional area 2 xx 10^(-6) m^(-2) . If the number density of free electrons in the wire is 5 xx 10^(26) m^(-3) , the drift speed of electrons is (given e = 1.6 xx 10^(-19) C)

An alpha particle of mass 6.4xx10^(-27) kg and charge 3.2xx10^(-19)C is situated in a uniform electric field of 1.6xx10^(5)Vm^(-1) . The velocity of the particle at the ennd of 2xx10^(-2)m path when it starts from rest is

SUBHASH PUBLICATION-SUPER MODEL QUESTION PAPER ( WITH ANSWERS ) -PART D
  1. State the law of radioactivity and hence, show that N=N(0)e^(-lambda ...

    Text Solution

    |

  2. Show that voltage gain in a transistor amplifier in CE mode is nega...

    Text Solution

    |

  3. An oil drop of 12 excess electrons is held stationary under a constant...

    Text Solution

    |

  4. (a) Six lead acid type of secondary cells each of 2.0 V and internal ...

    Text Solution

    |

  5. A circuit constaing 80 m H inductor and 60 muF capacitor in series is ...

    Text Solution

    |

  6. Calculate the distance between the centers of 4^(th) and 7^(th) bright...

    Text Solution

    |

  7. A 12.5eV electron beam is used to bombard gaseous hydrogen at room tem...

    Text Solution

    |

  8. How is the electric potential at a point due to a given charge measure...

    Text Solution

    |

  9. What is a hysteres curve ? Give any one application of study of hyste...

    Text Solution

    |

  10. Obtain an expression for the impedance of a series LCR circuit. (using...

    Text Solution

    |

  11. Obtain the expression for fringe width in the case of interference of ...

    Text Solution

    |

  12. Deduce the condition for balance of a wheatstone's bridge using...

    Text Solution

    |

  13. Derive the expression for magnetic field at a point on the axis of a c...

    Text Solution

    |

  14. Write any five properites of ferromagnetic materials

    Text Solution

    |

  15. Derive th lens maker's formula.

    Text Solution

    |

  16. State the law of radioactivity and hence, show that N=N(0)e^(-lambda ...

    Text Solution

    |

  17. What is rectification with relevant circuit diagram and waveform exp...

    Text Solution

    |

  18. Two point charges q(A)=3muC and q(B)=-3muC are located 0.2 m apart in ...

    Text Solution

    |

  19. Which two resistors are connected in series with a cell of emf 2V and ...

    Text Solution

    |

  20. A source of alternating emf of 220 V-50 Hz is connected in series wit...

    Text Solution

    |