Home
Class 12
PHYSICS
A charge q is placed at the centre of th...

A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to:

A

`-Q/2`

B

`-Q/4`

C

`+Q/4`

D

`+Q/2`

Text Solution

Verified by Experts

The correct Answer is:
B
Since q is at the centre of two charge Q and Q, net force on it is zero, whatever the magnitude and sign of charge on it. For the equilibrium of Q, q should be negative because other charge Q will repel it, so q should attract it. Simultaneously these attractions and repulsions should be equal.
Promotional Banner

Topper's Solved these Questions

  • ELECTRIC CHARGES AND FIELDS

    NARAYNA|Exercise EXERCISE -1 (H.W)|27 Videos

  • ELECTRIC CHARGES AND FIELDS

    NARAYNA|Exercise EXERCISE -2 (C.W.)|39 Videos

  • ELECTRIC CHARGES AND FIELDS

    NARAYNA|Exercise C.U.Q|81 Videos

  • DUAL NATURE

    NARAYNA|Exercise LEVEL-II (H.W)|17 Videos

  • ELECTRO MAGNETIC INDUCTION

    NARAYNA|Exercise Level-II (H.W)|23 Videos

Similar Questions

Explore conceptually related problems

If a charge q is placed at the centre of the line joining two equal charges Q such that the system is in equilibrium then the value of q is

A point charge q is placed at the centre of a line joining two equal charges Q. The whole system is in the state of equilibrium. Can you impose some lower limit on the magnitude of the charge Q?

A charge "q" is placed at the centroid of an equilateral triangle. Three charges having same "],[" charge equal to "Q" are placed at the vertices of the triangle.The system of four charges will be in equilibrium if "q" is equal to

A charge q is placed in the middle of a line joining the two equal and like point charge Q .This charge q will remain in equilibrium if q=(Q)/(x) .What is x ?

A charge Q is placed at the centre of the line joining two point charges +q and +q as shown in figure. The ratio of charges Q and q is

Two equal charges, +Q each, are at a distance r from each other. A third charge is placed on the line joining the above two charges such that all these charges are in equilibrium. Find q, in terms of Q.

Two point charges q_(1) = +2 C and q_(2) = - 1C are separated by a distance d . The position on the line joining the two charges where a third charge q = + 1 C will be in equilibrium is at a distance

Two idential point charges Q are kept at a distance r from each other. A third point charge is placed on the line joing the above two charges such that all the three charges are in equilibrium. The third charge (a) should be of magnitude q=……….. (b) should be of sign ....... (c ) should be placed ........ .

NARAYNA-ELECTRIC CHARGES AND FIELDS-EXERCISE -1 (C.W)
  1. Two identical coins be 4.5 m apart on a table. They carry similar char...

    Text Solution

    |

  2. Coulomb's law for electric charges, most closely resembles

    Text Solution

    |

  3. The ratio of the force between two small conducting spheres of equal c...

    Text Solution

    |

  4. Two identical metals balls with charges +2Q and -Q are separated by so...

    Text Solution

    |

  5. Two equally charged small metal balls placed at a fixed distance exper...

    Text Solution

    |

  6. There are two charges +2 mu C and -6 mu C at certain separation.Then ...

    Text Solution

    |

  7. Two particles , each of mass m and carrying charge Q , are separated b...

    Text Solution

    |

  8. Two particles having charge Q(1) and Q(2) , when kept at a certain dis...

    Text Solution

    |

  9. Four charges are arranged at the corners of a square ABCD, as shown. ...

    Text Solution

    |

  10. The electric field inside a spherical shell of uniform surface charge ...

    Text Solution

    |

  11. the electric field intensity at apoint in space is equal in magnitude ...

    Text Solution

    |

  12. A sphere of radius R has a uniform distribution of electric charge in ...

    Text Solution

    |

  13. The electric field at the surface of a charged spherical conductor is ...

    Text Solution

    |

  14. The electrons are accelerated through a pontential difference V by an ...

    Text Solution

    |

  15. The total electric flux leaving a spherical surface of radius 1 cm and...

    Text Solution

    |

  16. A uniform electric field Ehati exists in a region containing the orign...

    Text Solution

    |

  17. A charge q is placed at the centre of the line joining two equal charg...

    Text Solution

    |

  18. A metallic solid sphere is placed in a uniform electric fied. The line...

    Text Solution

    |

  19. In the situatiioni when the Gaussian surface is so chosen that there a...

    Text Solution

    |

  20. Three charges q(1)=1 mu c,q(2)=2 mu c and q(3)=-3 mu c and four surfac...

    Text Solution

    |