A) \[80\,\Omega \]
B) \[125\,\Omega \]
C) \[120\,\Omega \]
D) \[100\,\Omega \]
Correct Answer: A
Solution :
\[{{R}_{G}}=20\Omega ,\,\,{{I}_{g}}=0.005\times 30=0.150A\] To read 15 V \[({{R}_{G}}+R){{I}_{g}}=15\] \[{{R}_{G}}+R=\frac{15}{0.15}=100\] \[R=100-{{R}_{G}}=100-20=80\Omega .\]
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