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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Self Evaluation Test - Electric Chages and Fields

  • question_answer
    Three charges +q, +2q and +4q are connected by string as shown in the figure. What is ration of tension in the strings AB and BC?

    A) 1 : 2     

    B)        1 : 3 

    C) 2 : 1                 

    D)        3 : 1

    Correct Answer: B

    Solution :

    [b] \[{{T}_{AB}}=\frac{kq\cdot 2q}{{{d}^{2}}}+\frac{kq\cdot 4q}{{{\left( 2d \right)}^{2}}}=\frac{3k{{q}^{2}}}{d}\] \[{{T}_{BC}}=\frac{k\cdot 4q\cdot 2q}{{{d}^{2}}}+\frac{kq\cdot 4q}{{{\left( 2d \right)}^{2}}}=\frac{9k{{q}^{2}}}{d}\]


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