10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    Given three equal resistors. How many different combination of these three resistances can be made?

    A)  Six

    B)  Five

    C)  Four  

    D)  Three

    Correct Answer: C

    Solution :

     If all the resistance are to be used every time,\[N={{2}^{n-1}}\] If any number of the given n resistances can be used at a time, then\[N={{2}^{n}}-1\]where, \[N\] is the number of various possible values of equivalent resistances. In the given problem, it will be assumed that all are to be used every time. So,          \[N={{2}^{3-1}}\]


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