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NEET Sample Paper NEET Sample Test Paper-47

  • question_answer
    A capacitor of \[20\mu F\] charged upto 500V is connected in parallel with another capacitor of \[10\mu F\]which is charged upto 200V. The common potential is:

    A) 250V                

    B) 300V     

    C) 400V                

    D) 600V

    Correct Answer: C

    Solution :

    Law of conservation of charge \[{{\operatorname{Q}}_{1}}+{{Q}_{2}}=Q\] \[{{\operatorname{C}}_{1}}{{V}_{1}}+{{\operatorname{C}}_{2}}{{V}_{2}}=\left( {{\operatorname{C}}_{1}}+{{C}_{2}} \right){{\operatorname{V}}_{common}}\] \[20\times 500+10\times 200=\left( 20+10 \right){{V}_{e}}\]          \[30{{V}_{e}} = 12000\] \[{{\operatorname{V}}_{e}}=400V\]


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