Home
Class 12
PHYSICS
Three charges 4q, Q and q are in a strai...

Three charges `4q, Q` and `q` are in a straight line in the position of `0. l//2` and `l` respectively. The resultant force on `q` will be zero, if `Q=`

A

Q = -q

B

Q = q

C

`Q = q^(2)`

D

Q = 2q

Text Solution

Verified by Experts

The correct Answer is:
A
The net force acting on charge q should be zero.
`F=1/(4piin_(0))[(4qxxq)/l^(2)+(Qq)/((l//2)^(2))]=0`
`therefore" "q+Q=0rArrQ=-q`
Promotional Banner

Topper's Solved these Questions

  • ELECTRONS AND PHOTONS

    NIKITA PUBLICATION|Exercise MCQs|162 Videos

  • GRAVITATION

    NIKITA PUBLICATION|Exercise Multiple Choice Questions|409 Videos

Similar Questions

Explore conceptually related problems

Three charge q , Q and -4q are placed in a straight line , line of length L at points distant 0 ,L//2 and L respectively from one end. In order to make the net force on q zero, the charge Q must be equal to

Charges 4Q, q and Q and placed along x-axis at positions x=0,x=t//2 and x=1 , respectively. Find the value of q so that force on charge Q is zero

For the system in figure find Q for which resultant force on q is zero.

Three point charges q, 2q and 8q are to be placed on a . 9cm long straight line. Find the . positions where the charges shouldbe placed such that the potential energy . of this sysrem is minimum. In this situation, what is the . electric field at the charge q due to the other two charges?

Charges Q-q, Q,-q are placed at the corners A, B, C,D of a square respectively. If the resultant force on the charge Q is zero due to other charges, what is the relation between Q and q ?

Three charge -q,+q and -q are placed at the cornors of an equilateral triangle of side a The resultant electric froce an a charge +q placed at a the centroid O of the triangle is

NIKITA PUBLICATION-ELECTROSTATICS-Multiple Choice Questions
  1. The electric potential at the surface of an atomic nucleus (Z = 50) of...

    Text Solution

    |

  2. An oil drop is found floating freely between thr plates of a parallel ...

    Text Solution

    |

  3. Three charges 4q, Q and q are in a straight line in the position of 0....

    Text Solution

    |

  4. Two point charges +9e and +e are kept at a distance 'a' from each othe...

    Text Solution

    |

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

    Text Solution

    |

  6. Electrons are caused to fall through a potential difference of 1500 V....

    Text Solution

    |

  7. The electric field in a region of space is given by, E=5veci+2vecj N...

    Text Solution

    |

  8. A given charge is situated at a certain distance from an electric dipo...

    Text Solution

    |

  9. Two small spheres, each carrying a charge q are placed r m apart and t...

    Text Solution

    |

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

    Text Solution

    |

  11. n small drops of same size are charged to V volts each .If they coales...

    Text Solution

    |

  12. A charged particle of mass m and charge q is released from rest in an ...

    Text Solution

    |

  13. A H(2) atom consits of a proton and an electron that revolves in a cir...

    Text Solution

    |

  14. A parallel plate condenser with air as dielectric has capacity C(0)=(i...

    Text Solution

    |

  15. If K is the dielectric constant of the medium. A is area of insulated ...

    Text Solution

    |

  16. The space between parallel plate capacitors is filled with four dielec...

    Text Solution

    |

  17. The expression for the capacity of the capacitor formed by compound di...

    Text Solution

    |

  18. Two insulated metallic spheres of 3mu F and 5 muF capacitances are cha...

    Text Solution

    |

  19. The 500 muF capacitor is charged at a steady rate of 100 mu C//s. The ...

    Text Solution

    |

  20. An unchanged capacitor with a solid dielectric is connected to a simil...

    Text Solution

    |