Home
Class 11
PHYSICS
An electron is projected as in figure wi...

An electron is projected as in figure with kinetic energy K, at an angle `theta=45^(@)` between two charged plates. The magnitude of the electric field so that the electron just fails to strike the upper plate, should be greater than:

A

`K/(qd)`

B

`(2K)/(qd)`

C

`K/(2qd)`

D

iInifinite

Text Solution

Verified by Experts

The correct Answer is:
C
If particle will loose KE (in that direction) against work done by electric field `K/2=qEdrArr E=K/(2qd)`
Promotional Banner

Topper's Solved these Questions

  • MISCELLANEOUS

    ALLEN |Exercise Exersice-03|7 Videos

  • MISCELLANEOUS

    ALLEN |Exercise ASSERTION-REASON|18 Videos

  • MISCELLANEOUS

    ALLEN |Exercise Part -II Example Some worked out Examples|1 Videos

  • KINEMATICS (MOTION ALONG A STRAIGHT LINE AND MOTION IN A PLANE)

    ALLEN |Exercise BEGINNER S BOX-7|8 Videos

  • PHYSICAL WORLD, UNITS AND DIMENSIONS & ERRORS IN MEASUREMENT

    ALLEN |Exercise EXERCISE-IV|7 Videos

Similar Questions

Explore conceptually related problems

A parallel plate capacitor is made of two circular plates separated by a distanc of 5mm and with a dielectric of dielectric constant 2.2 between them . When the electric field in the dielectric is 3xx10^(4) V/m the charge density of the positive plate will be close to :

If electric charge on capacitor formed by two plates of area A is Q, then electric field between them is …..

An electron passes between two parallel plate of a capacitor as shown in the diagram. The electron enters the plate at t=0 and it comes out of the plates at time t=T. The electron hits the screen at A, as shown. Now a time varying potential difference V is applied between the plates, as shown in the graph. (Neglect the gravity). The point where the electron now will strike (as compared to point A) will be

Two metallic plate A and B , each of area 5 xx 10^(-4)m^(2) , are placed parallel to each at a separation of 1 cm plate B carries a positive charge of 33.7 xx 10^(-12) C A monocharonatic beam of light , with photoes of energy 5 eV each , starts falling on plate A at t = 0 so that 10^(16) photons fall on it per square meter per second. Assume that one photoelectron is emitted for every 10^(6) incident photons fall on it per square meter per second. Also assume that all the emitted photoelectrons are collected by plate B and the work function of plate A remain constant at the value 2 eV Determine (a) the number of photoelectrons emitted up to i = 10s, (b) the magnitude of the electron field between the plate A and B at i = 10 s, and (c ) the kinetic energy of the most energotic photoelectrons emitted at i = 10 s whenit reaches plate B Negilect the time taken by the photoelectrons to reach plate B Take epsilon_(0) = 8.85 xx 10^(-12)C^(2)N- m^(2)

A cavity pf radius r is present inside a solid dielectric sphere of radius R , having a volume charge density of rho . The distance between the centres of the sphere and the cavity is a . An electron e is kept inside the cavity at an angle theta = 45^@ as shown . how long will it take to touch the sphere again ? .

Flow cytometry, illustrated in the figure, is a technique used to sort cells by type. The cells are placed in a conducting saline solution which is then forced from a nozzle. The stream breaks up into small droplets, each containing one cell. A metal collar surrounds the stream right at the point where the droplets seprate from the stream. Charging the collar polarizes the conducting liquid, causing the droplets to become charged as they break off from the steam. A leser beam probes the solution just upstream from the charging collar, looking for the presence of certain types of cells. All droplets containing one particular type of cell are given the same charge by the charging collar. Droplets with other desired types of cells receive a different charge, and droplats with no desired cell receive no charge. The charged. The charges droplets then pass between two parallel charged electrodes where they receive a horizontal force that directs force that directs them into different collection tubes, depending on air charge. Another way to sort the droplets would be to given each droplet the same charge, then vary the electric field between the deflection plates. For the apparatus as sketched, this technique will not work because

A tiny charged pellet of mass m is suspended at rest by the electric field between two horizontal, charged metallic plates. The lower plate has a positive charge and the upper plate has a negative charge. Which statement in the answers here is // are true?

A particle of mass m and charge (-q) enters the region between the two charged plates initially moving along x-axis with speed v_x (like particle 1 in figure. The length of plate is L and an uniform electric field E is maintained between the plates. Show that the vertical deflection of the particle at the far edge of the plate is qEL^(2)//(2m v_(x)^(2)) . Compare this motion with motion of a projectile in gravitational field discussed in Section 4.10 of Class XI Textbook of Physics.

Show that the force on each plate of a parallel plate capacitor has a magnitude equal to (1//2) QE, where Q is the charge on the capacitor, and E is the magnitude of electric field between the plates. Explain the origin of the factor 1//2 .

ALLEN -MISCELLANEOUS-Exercise-01
  1. Two infinite linear charges are placed parallel to each other at a dis...

    Text Solution

    |

  2. An electron of mass m(e ) initially at rest moves through a certain di...

    Text Solution

    |

  3. An electron is projected as in figure with kinetic energy K, at an ang...

    Text Solution

    |

  4. A proton sists at coordinates (x,y)=(0, 0), and an electron at (d, h),...

    Text Solution

    |

  5. A positive point charge 50mu C is located in the plane xy at a point w...

    Text Solution

    |

  6. Three point charges 1C, 2C and 3C are placed at the corners of an equi...

    Text Solution

    |

  7. Rank the work required to assemble the charge distribution below from ...

    Text Solution

    |

  8. The are AB with the centre C and infinitely long wire having linear ch...

    Text Solution

    |

  9. The diagram shows the electric field lines produced by an electrostali...

    Text Solution

    |

  10. As per this diagram a point charge +q is placed at the origin O. Work ...

    Text Solution

    |

  11. Two identical thin ring, each of radius R meters, are coaxially placed...

    Text Solution

    |

  12. Two identical particles of mass m carry a charge Q, each. Initially on...

    Text Solution

    |

  13. In a regular polygon of n sides, each corner is at a distance r from t...

    Text Solution

    |

  14. An alpha particle of energy 5 MeV is scattered through 180^(@) by a fi...

    Text Solution

    |

  15. A charge 3 coulomb experiences a force 300 N when placed in a uniform ...

    Text Solution

    |

  16. Uniform electric field of magnitude 100 V//m in space is directed alon...

    Text Solution

    |

  17. The equation of an equipotential line in an electric field is y = 2 x...

    Text Solution

    |

  18. In a certain region of space, the potential is given by V=k(2x^(2)-y^(...

    Text Solution

    |

  19. Figure shown two equipotential lies x, y plane for an electric field. ...

    Text Solution

    |

  20. The electric potential V(z, y,z) for a planar charge distribution is g...

    Text Solution

    |