Home
Class 12
PHYSICS
A thin semi-circular ring of radius r ha...

A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it. The net field `vecE` at the centre O is

A

`q/(2pi^2epsi_0r^2)hatj`

B

`q/(4pi^2 epsi_0r^2)hatj`

C

`-q/(4pi^2 epsi_0r^2)hatj`

D

`-q/(4pi^2 epsi_0r^2)hatj`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

A thin circular wire of radius r has a charge Q. If a point charge q is placed at the centre of the ring, then find the increase in tension in the wire.

A circular ring of radius R with uniform positive charge density lambda per unit length is located in the y-z plane with its centre at the origin O. A particle of mass m and positive charge q is projected from the point P (Rsqrt3, 0, 0) on the positive x-axis directly towards O, with an initial speed v. Find the smallest (non-zero) value of the speed v such that the particle does not return to P.

A spherical conductor of radius 12 cm has a charge of 1.6 xx 10^(-7) C distributed uniformly on its surface . What is the electric field (a) inside the sphere (b) just outside the sphere. (c) at a point 18 cm from the centre of the sphere ?

A thin spherical shell of radius R has charge Q spread uniformly over its surface. Which of the following graphs most closely represents the electric field E(r) produced by the shell in the range 0lerltoo , where r is the distance from the centre of the shell?

A spherical conductor of radius 12 cm has a charge of 1.6 xx 10^(-7) C distributed uniformly on its surface. What is the electric field (a) inside the sphere (b) just outside the sphere (c) at a point 18 cm from the centre of the sphere?

A conducting sphere of radius R is given a charge Q. The electric potential and the electric field at the centre of the sphere respectively are

A non-conducting ring of radius 0.5 m carries a total charge 1.11xx10^(-10)C distributed non-uniformly on its circumference producing an electric field E evergy where in space. The value of the integral int_(t=oo)^(i=0)-vec(E).vec(d)l ( l=0 being centre of the ring) in volt is:

A positive charge Q is uniformly distribut along a circular ring of radius R. A small tc charge q is placed at the centre of the ring per figure, Then

A thin spherical conducting shell of radius R has a charge q. Another charge Q is placed at the centre of the shell. The electrostatic potential at a point P a distance R/2 from the centre of the shell is

ALLEN -TEST PAPER 3-PHYSICS
  1. A charge Q1 exerts some force on a second charge Q2. If a 3rd charge Q...

    Text Solution

    |

  2. Two particles A and B having equal charges are placed at distance d ap...

    Text Solution

    |

  3. An infinite number of charges, each of magnitude q, are placed along x...

    Text Solution

    |

  4. Two pitch balls carrying equal charges are suspended from a common poi...

    Text Solution

    |

  5. Two spheres A and B are charged with the charges of +10 and +20 coulom...

    Text Solution

    |

  6. The electric field due to a uniformly charged sphere is maximum at :

    Text Solution

    |

  7. Charges q, 2q,3q and 4q are placed at the corners A,B,C and D of a squ...

    Text Solution

    |

  8. A charged oil drop is suspended in a uniform filed of 3xx10^4 v//m so ...

    Text Solution

    |

  9. The electric field at a distance (3R)/2 from the centre of a charged ...

    Text Solution

    |

  10. Four point +ve charges of same magnitude (Q) are placed at four corner...

    Text Solution

    |

  11. A thin semi-circular ring of radius r has a positive charge q distribu...

    Text Solution

    |

  12. Three positive charges of equal value q are placed at the verticles of...

    Text Solution

    |

  13. A Gaussian surface in the fig. is shown by dotted line. The electric f...

    Text Solution

    |

  14. The length of each side of a cubical surface is l. If charge q is situ...

    Text Solution

    |

  15. A positively charged body 'A' has been brought near a neutral brass sp...

    Text Solution

    |

  16. Inside a charged hollow spherical conductor. the potential :-

    Text Solution

    |

  17. Equal charges q are placed at the three corners B, C, D of a square A...

    Text Solution

    |

  18. Charges are placed on the verticles of a as shown. Let vec(E) be the e...

    Text Solution

    |

  19. The variation of potential with distance r from a fixed point is shown...

    Text Solution

    |

  20. Three charges Q, +q and +q are placed at the vertices of a right angle...

    Text Solution

    |