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STD 12 - 4. Moving charges and magnetism — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 4. Moving charges and magnetism4 Marks
MCQ
A galvanometer having a resistance $G$ and current $I_g$ flowing in it, produces full scale defection. If $S_1$ is the value of shunt which converts it into an ammeter of range $0-I$ and $S_2$ is the value of shunt for range $0-8I$ . Then the ratio $\frac {S_1}{S_2}$ will be
  • ✓
    $\frac{{8I - {I_g}}}{{I - {I_g}}}$
  • B
    $1$
  • C
    $8$
  • D
    $\frac{1}{2}\left( {\frac{{I - {I_g}}}{{8I - {I_g}}}} \right)$
✓

Answer

Correct option: A.
$\frac{{8I - {I_g}}}{{I - {I_g}}}$
a
$\frac{{{S_1}}}{{{S_2}}} = \frac{{\frac{{{I_g}{R_g}}}{{I - {I_g}}}}}{{\frac{{{I_g}{R_g}}}{{8I - {I_g}}}}} = \frac{{8I - {I_g}}}{{I - {I_g}}}$

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