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NEET Sample Paper NEET Sample Test Paper-49

  • question_answer
    Two resistances are connected in two gaps of a meter bridge. The balance point is 20 cm from the zero end. A resistance of 15 ohm is connected in series with the smaller of the two. The null point shifts to 40 cm. The value of the smaller resistance in ohm is-

    A) 3                                 

    B) 6

    C) 9                                 

    D) 12

    Correct Answer: C

    Solution :

    \[\frac{x}{y}=\,\,\frac{20}{80}\] \[\frac{x+15}{y}\,\,=\,\,\frac{40}{60}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,......(ii)\] by solving (i) & (ii)


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