Home
Class 12
PHYSICS
The spheres of radius r and R having cha...

The spheres of radius r and R having charge q and Q respectively on them . When they are joined with conducting ,wire, the energy of this system does not dissipated then ...........

A

qr= QR

B

qR=Qr

C

`qr^(2)=QR^(2)`

D

`qR^(2)=Qr^(2)`

Text Solution

Verified by Experts

When both spheres are joined, they are in parallel, hence the potential on both the spheres are equal. `:. V_(r) =V_(R):. (kq)/(r)=(kQ)/(R):. (q)/(r)=(Q)/(R) :. qR=Qr`
Promotional Banner

Topper's Solved these Questions

  • ELECTROSTATIC POTENTIAL AND CAPACITANCE

    KUMAR PRAKASHAN|Exercise Section D ( MCQs asked in Cometitive Exams )|39 Videos

  • ELECTROSTATIC POTENTIAL AND CAPACITANCE

    KUMAR PRAKASHAN|Exercise Section C ( NCERT Exemplar Solution ) ( Long Answer Type Questions )|12 Videos

  • ELECTROMAGNETIC WAVES

    KUMAR PRAKASHAN|Exercise BOARD.S QUESTION PAPER MARCH - 2020 (PART - B) SECTION - C|5 Videos

  • MAGNETISM AND MATTER

    KUMAR PRAKASHAN|Exercise SECTION D Multiple Choice Questions (MCQs) (MCQs asked in Competitive Exams) MCQs asked in Board Exam and GUJCET|7 Videos

Similar Questions

Explore conceptually related problems

Two conducting hollow spherical shells of radius R and 2R carry charges -Q and 3Q respectively. How much charge will flow into the earth if inner shell is grounded?

80 microC charge is given on sphere of 4 cm radius and 40 muC charge is given on sphere of 6 cm radius. If they are connected by a conducting wire, then charge transferred from sphere of 4 cm radius to sphere of 6 cm radius will be......

A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre

Q amount of electric charge is present on the surface of a sphere having radius R. Calculate the total energy of the system.

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 positive charge Q is uniformly distributed throughout the volume of a dielectric sphere of radius R. A point mass having charge +q and mass m is fired toward the center of the sphere with velocity v from a point at distance r (r gt R) from the center of the sphere. Find the minimum velocity v so that it can penetrate (R//2) distance of the sphere. Neglect any resistance other than electric interaction. Charge on the small mass remains constant throughout the motion.

Two non-conducting solid spheres of radii R and 2R, having uniform volume charge densities rho_1 and rho_2 respectively, touch each other. The net electric field at a distance 2R from the centre of the smaller sphere, along the line joining the centres of the spheres, is zero. The ratio rho_1/rho_2 can be

Three concentric conducting spherical shells have radii r, 2r, and 3r and charges q_1,q_2 and q_3 , respectively. Innermost and outermost shells are earthed as shown in figure. The charges shown are after earthing. Select the correct alternative.

Three solid sphere of mass M and radius R are placed in contact as shown in figure. Find the potential energy of the system ?

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.

KUMAR PRAKASHAN-ELECTROSTATIC POTENTIAL AND CAPACITANCE-Section D ( Multiple Choice Questions (MCQs) )
  1. Potenlials of points P and Q are 10V and -4 V respectively. Work done...

    Text Solution

    |

  2. A point P al a certain distance from charge Q has electric potential 6...

    Text Solution

    |

  3. The spheres of radius r and R having charge q and Q respectively on th...

    Text Solution

    |

  4. The spherical shell has radius r. The potential difference V is betwee...

    Text Solution

    |

  5. The radius of a charged hollow sphere is 10 cm. If V is the potential ...

    Text Solution

    |

  6. Electrostatic potential is ...... physical quantity.

    Text Solution

    |

  7. Kinetic energy of a charged particle decreases by 100 J when it is bro...

    Text Solution

    |

  8. Electric potential at 5 can distance from centre of shell of 14 cm rad...

    Text Solution

    |

  9. A particle having mass 1 g and electric charge 10^(-8) C travels from...

    Text Solution

    |

  10. The electric potential due to any point electric dipole varies as .......

    Text Solution

    |

  11. Two charges - q and + q are located at points A(0, 0, - a) and B(0, 0,...

    Text Solution

    |

  12. The dipole moment of a dipole is 4 xx 10^(-9) Cm. The po1ential of a p...

    Text Solution

    |

  13. 10 muC charge Is placed on each vertex of equilateral triangle of 10 c...

    Text Solution

    |

  14. For a point on the axis of the electric dipole theta = 0 and theta = p...

    Text Solution

    |

  15. Potential energy of an electric dipole is minimum (Negatively maximum)...

    Text Solution

    |

  16. When a n electric dipole is in st able equilibrium, in uniform electri...

    Text Solution

    |

  17. A surface, value of electric potential on whichis same at all the poin...

    Text Solution

    |

  18. Angle between equipotential surface and electric field is ......

    Text Solution

    |

  19. A V - X graph for an electric field in X-direction is shown in the fig...

    Text Solution

    |

  20. Uniformly polarised dielectric has ...... of induced charge.

    Text Solution

    |