Home
Class 12
PHYSICS
(A): A small metal ball is suspended in ...

(A): A small metal ball is suspended in a uniform electric field with an insulated thread. If high energy X-ray beam falls on the ball, the ball will be deflected in the electric field.
(R ): X-rays emits photoelectron and metal becomes negatively charged.

A

Both .A. and .R. are true and .R. is the correct explanation of .A.

B

Both .A. and .R. are tru and .R. is not the correct explanation of .A.

C

A. is true and .R. is false

D

A. is false and .R. is true

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • ELECTRIC CHARGES AND FIELDS

    AAKASH SERIES|Exercise Exercise-II|56 Videos

  • ELECTRIC CHARGES AND FIELDS

    AAKASH SERIES|Exercise Practice Exercise|57 Videos

  • ELECTRIC CHARGES AND FIELDS

    AAKASH SERIES|Exercise Assess Your Self|13 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    AAKASH SERIES|Exercise PRACTICE EXERCISEX|44 Videos

  • ELECTRIC FIELD AND POTENTIAL

    AAKASH SERIES|Exercise PROBLEMS (LEVEL-II)|32 Videos

Similar Questions

Explore conceptually related problems

An electron of mass m and charge e is fired perpendicular to a uniform electric field of intensity E with an initial velocity u. If the electron traverses a distance x in the field in the direction of firing, find the transverse displacement y it suffers.

Two charged particles each of mass 9.8 g and charges + 20 mu C and -20 mu C are attached to the two ends of a massless and rigid uniform non-conducting rod of length 50 cm. This arrangement is held in a uniform electric field of 12.1 NC^(-1) such that the rod makes a very small angle with the field direction. If the rod is set free the minimum time needed for the rod to become parallel to the direction of the electric field is ............ seconds.

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) (as in the fig.). 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)//(2mV_(x)^(2)) . Compare this motion with motion of a projectille in gravitational field discussed in section 4.10 of 1^(st) Year Textbook of Physics.

A magnetic field set up using Helmholtz coils (described in Exercise 4.16) is uniform in a small region and has a magnitude of 0.75 T. In the same region, a uniform electrostatic field is maintained in a direction normal to the common axis of the coils. A narrow beam of (single species) charged particles all accelerated through 15 kV enters this region in a direction perpendicular to both the axis of the coils and the electrostatic field. If the beam remains undeflected when the electrostatic field is 9.0 x× 10^(-5 )V m^(-1) , make a simple guess as to what the beam contains. Why is the answer not unique?

Consider a metal ball of radius r moving at a constant velocity v in a uniform magnetic field of induction of velocity forms an angle alpha with the direction of bar B , the maximum potential difference between points on the ball is

AAKASH SERIES-ELECTRIC CHARGES AND FIELDS-Exercise-I
  1. (A): Coulomb force between charges is central force (R ): Coulomb fo...

    Text Solution

    |

  2. (A): Two particles of same charge projected with different velocity no...

    Text Solution

    |

  3. (A): The coulomb force is the dominating force in the universe (R ):...

    Text Solution

    |

  4. (A): Electric and gravitational fields are acting along same line. Whe...

    Text Solution

    |

  5. (A): If there exists coulomb attraction between two bodies, both of th...

    Text Solution

    |

  6. (A) : No two electric lines of force can intersect each other (R ): ...

    Text Solution

    |

  7. (A ): Magnitude of electric force acting on a proton and an electron, ...

    Text Solution

    |

  8. (A ): Sharper is the curvature of spot on a charged body lesser will b...

    Text Solution

    |

  9. (A ): The surface densities of two spherical conductors of different r...

    Text Solution

    |

  10. (A ): A charged particle free to move in an electric field always move...

    Text Solution

    |

  11. (A ): Mass of a body decreases slightly when it negatively charged. ...

    Text Solution

    |

  12. (A ): Coulomb force is a long range force. (R ): Coulomb force acts ...

    Text Solution

    |

  13. (A): A small metal ball is suspended in a uniform electric field with ...

    Text Solution

    |

  14. (A ): A charge is lying at the centre of the line joining two similar ...

    Text Solution

    |

  15. (A): If a conducting medium is placed between two charges, then electr...

    Text Solution

    |

  16. (A): A point charge is lying at the centre of a cube of each side. The...

    Text Solution

    |

  17. (A) : In a cavity within a conductor, the electric field is zero. (R...

    Text Solution

    |

  18. (A): The typres of aircrafts are slightly conducting. (R ): If a con...

    Text Solution

    |

  19. (A): A bird perches on a high power lines and nothing happends to the ...

    Text Solution

    |

  20. A: A metallic shield in the form of a hollow shell may be built to blo...

    Text Solution

    |