2. Questions Bank
  3. 12th Class
  4. Physics
  5. Magnetism

12th Class Physics Magnetism Question Bank MCQ - Moving Charges and Magnetism

  • question_answer
                A galvanometer of resistane \[\text{70}\,\Omega \], is converted to an ammeter by a shunt resistance \[{{r}_{s}}=0.03\,\Omega \]. The value of its resistance will become:                              

    A) \[0.025\,\Omega \]                     

    B) \[0.022\,\Omega \]

    C) \[0.035\,\Omega \]                     

    D) \[0.030\,\Omega \]

    Correct Answer: D

    Solution :

    (d) \[0.030\,\Omega \]             \[R=\frac{{{R}_{G}}{{r}_{s}}}{{{R}_{G}}+{{r}_{s}}}\] Here,     \[{{R}_{G}}=70\,\Omega ,{{r}_{s}}=0.03\,\Omega \] \[\therefore R=\frac{70\times 0.03}{70+0.03}=0.02998=0.030\,\Omega \]


You need to login to perform this action.
You will be redirected in 3 sec spinner