NEET Sample Paper NEET Sample Test Paper-1

  • question_answer The resistance of a galvanometer is 60. and it can measure a maximum current of 2amp, then required shunt resistance to convert it into an ammeter reads upto 6 amp, will be:

    A)  50                  

    B)  40

    C)  30                  

    D)  20

    Correct Answer: C

    Solution :

    The resistance of the galvanometer \[G=6\Omega \] maximum current through the galvanometer\[{{i}_{g}}=2\] amp Final current in ammeter \[i=6\] amp The current through the galvanometer is given by \[{{i}_{g}}=\frac{S}{S+G}\times i\] (where S is the resistance of shunt) \[\Rightarrow \]               \[2=\frac{S}{S+6}\times 6\] \[\Rightarrow \]               \[2S+12=6S.\] \[\Rightarrow \]               \[4S=12\] \[\Rightarrow \]               \[S=3\Omega \].

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