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Two large conduction spheres carrying ch...

Two large conduction spheres carrying charges `Q_(1)` and `Q_(2)` are brought close to each other. Is the magnitude of the force between them exactly given by `Q_(1)Q_(2)//4piepsilon_(0)r^(2)`. Where r is the distance between their centers.

Text Solution

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No, as when two charged spheres are kept together, the charge distribution will not remain uniform due to induction thus we cannot apply Coulomb.s law to calculate the electrostatic force.
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Knowledge Check

  • In the following question a statement of assertion (A) is followed by a statement of reason (R ) A : Two large conducting spheres carrying charges Q_(1) and Q_(2) are brought close to each other. The magnitude of electrostatic force between them is exactly given by Q_(1) Q_(2)// 4 pi epsilon_(0) r^(2) , where r is the distance between their centres. R: Here charges Q_(1) and Q_(2) can be assumed to be concentrated at the centres of their respective spheres.

    A
    If both Assertion & Reason are true and the reason is the correct explanation of the assertion , then mark (1).
    B
    If both Assertion & Reason are true but the reason is not correct explanation of the assertion then mark (2)
    C
    If Assertion is true statement but Reason is false, then mark (3)
    D
    If both Assertion and Reason are false statements , then mark (4).

  • Two conducting spheres of radii r_(1) and r_(2) having charges Q_(1) and Q_(2) respectively are connected to each other. There is

    A
    no change in the energy of the system
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  • Two isolated charged metallic spheres of radii R_(1) and R_(2) having charges Q_(1) and Q_(2) respectively are connected to each other, then there is-

    A
    No change in the electrical energy of the system
    B
    An increase in the electrical energy of the system
    C
    Always a decrease in the electrical energy of the system
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    A decrease in electrical energy of the system until `Q_(1) R_(2)= Q_(2)R_(3)`

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