Home
Class 12
PHYSICS
Two positive point charges of 12 mu C an...

Two positive point charges of `12 mu C` and `8 mu C` are `10 cm` apart. The work done in bringing then `4 cm` closer is

A

5.8 J

B

5.8 eV

C

13 J

D

13 eV

Text Solution

Verified by Experts

The correct Answer is:
C
`W=U_f-U_i=(Kq_1q_2)/r_2-(Kq_1q_2)/r_1`
`= 9 xx10^9 xx12 xx8 xx10^(-12) [1/4-1/10] xx1/(10^(-2))`
`=129.6 xx10^(-1) =12.96 J = 12.96 ~~13J`
Promotional Banner

Topper's Solved these Questions

  • ELECTROSTATICS

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Electric Dipole)|21 Videos

  • ELECTROSTATICS

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Electric Flux and Gauss.s Law)|27 Videos

  • ELECTROSTATICS

    ERRORLESS|Exercise ASSERTION & REASON|25 Videos

  • ELECTRONICS

    ERRORLESS|Exercise Assertion & Reason|26 Videos

  • MAGNETIC EFFECTS OF CURRENT

    ERRORLESS|Exercise ASSERTION & REASON |18 Videos

Similar Questions

Explore conceptually related problems

Two positive point charges 15 muC and 10 muC are 30 cm apart. Calculate the work done in bringing them closer to each other by 15 cm.

Two positive point charges of 0.2 muC and 0.01 muC are placed 10 cm apart. Calculate the work done in reducing the distance to 5 cm.

Two positive point charges of 12 and 5 microcoulombs, are placed 10 cm apart in air. The work needed to bring them 4 cm closer is

Two charges of 5muC and 20muC are placed 20 cm apart. Calculate the work done in bringing the charges closer to 15 cm apart.

Two positive charges of 1mu C and 2 mu C are placed 1 metre apart. The value of electric field in N/C at the middle point of the line joining the charge will be :

Two point charges of 20 mu C and 80 muC are 10 cm apart where will the electric field strength be zero on the line joining the charges from 20 mu C charge

Two point charge - 5 mu C and + 3 mu C are placed 64 cm apart. At what points on the line joining the two charges is the electric potential zero. Assume the potential at infinity to be zero.

Two point charges - 5 mu C and + 3 muC are placed 64 cm apart . At what points on the line joining the two charges is the electric potential zero ? (Assume the potential at infinity to be zero) .

Two point charges 2 mu C and 8 mu C areplaced 12 cm apart. Find the position of the point where the electric field intensity will be zero.

Two point charges 2 mu C and 8 mu C are placed 12 cm apart. Find the position of the point where the electric field intensity will be zero.

ERRORLESS-ELECTROSTATICS-NCERT BASED QUESTIONS (Electric Field and Potential)
  1. The charge given to any conductor resides on its outer surface because

    Text Solution

    |

  2. A particle of mass m and charge q is placed at rest in a uniform elect...

    Text Solution

    |

  3. Two positive point charges of 12 mu C and 8 mu C are 10 cm apart. The ...

    Text Solution

    |

  4. The displacement of a charge Q in the electric field vec(E) = e(1)hat(...

    Text Solution

    |

  5. In the rectangle, shown below, the two corners have charges q(1) = - 5...

    Text Solution

    |

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

    Text Solution

    |

  7. Identify the WRONG statement.

    Text Solution

    |

  8. A particle of mass M and charge q is released from rest in a region of...

    Text Solution

    |

  9. When a negative charge is taken at a height from earth's surface, then...

    Text Solution

    |

  10. A bullet of mass 2 gm is having a charge of 2 muc. Through what potent...

    Text Solution

    |

  11. A square of side a charge Q at its centre and charge q at one of the c...

    Text Solution

    |

  12. Poistive and negative point charges of equal magnitude are kept at (0,...

    Text Solution

    |

  13. Two insulting plates are both uniformly charged in such a way that the...

    Text Solution

    |

  14. Charges +q and -q are placed at points A and B respectively which are ...

    Text Solution

    |

  15. Three cahrges each+q, are placed at the corners of an isosceles trinag...

    Text Solution

    |

  16. An electron of mass m and charge q is accelerated from rest in a unifo...

    Text Solution

    |

  17. A soap bubble is given a negative charge, then its radius

    Text Solution

    |

  18. A point charge is surrounded symmetrically by six identical charges at...

    Text Solution

    |

  19. A positively charged particle is released from rest in a uniform elect...

    Text Solution

    |

  20. The mean free path of electrons in a metal is 4 xx 10^(-8)m The elect...

    Text Solution

    |