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NEET Sample Paper NEET Sample Test Paper-64

  • question_answer
    A coil of Cu wire (radius--r, self-inductance---L) is bent in two concentric turns each having radius\[r/2\]. The self-inductance now

    A) 2 L

    B)                           L

    C) 4 L                              

    D) L/2

    Correct Answer: A

    Solution :

    \[\because \,\,\,\,\,L\propto {{N}^{2}}{{r}^{.}},\,\,\frac{{{L}_{1}}}{{{L}_{2}}}\,\,=\,\,{{\left( \frac{{{N}_{1}}}{{{N}_{2}}} \right)}^{2}}\,\,\,\times \,\,\frac{{{r}_{1}}}{{{r}_{2}}}\] \[\Rightarrow \,\,\,\,\frac{L}{{{L}_{2}}}\,=\,\,{{\left( \frac{1}{2} \right)}^{2}}\,\times \,\,\left( \frac{r}{r/2} \right)\,\,=\,\,\frac{1}{2}\,;\,\,\,{{L}_{2}}\,\,\,=\,\,2L\]


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