A galvanometer having a coil resistance $100 \;\Omega$ gives a full scale deflection when a current of $1 \;\mathrm{mA}$ is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of $10\; \mathrm{V} ?$......$k\Omega$
A$9.9$
B$8.9$
C$7.9$
D$10$
JEE MAIN 2020, Medium
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A$9.9$
a $\mathrm{i}_{\mathrm{g}}=1 \mathrm{mA}, \mathrm{R}_{\mathrm{g}}=100 \Omega$
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