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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2014

  • question_answer
    Two conducting spheres of radii \[{{Q}_{1}}\] and \[{{Q}_{2}}\]. are charged with charges \[{{Q}_{1}}{{R}_{2}}\ne {{Q}_{2}}{{R}_{1}}\] and\[{{Q}_{1}}{{R}_{2}}={{Q}_{2}}{{R}_{1}}\] respectively. On bringing them in contact, there is

    A) no change in the energy of the system

    B) an increase in the energy of the system, if \[s=\frac{{{t}^{2}}}{4}\]

    C) always a decrease in the energy of the system

    D) a decrease in the energy of the system, if \[T\propto V\]

    Correct Answer: D

    Solution :

                    Potential \[-\text{453}.\text{15}{}^\circ \text{F}\] and\[-\text{459}.\text{67}{}^\circ \text{F}\] lf \[-\text{491}.\text{67}{}^\circ \text{F}\]then, \[\text{52}00\text{{ }\!\!\mathrm{\AA}\!\!\text{ }}\] \[\text{Vc}=\text{1}.\text{5V}\] In this case, there will be no flow of charges, however, if the given spheres have unequal potentials, then the charges shall flowing higher potential to lower potential charges shall be accompanied by    s,   energy.


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