JEE MAIN - Physics (2020 - 8th January Evening Slot - No. 16)
A galvanometer having a coil resistance
100 $$\Omega $$ gives a full scale deflection when a
current of 1 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 V?
8.9 k$$\Omega $$
10 k$$\Omega $$
9.9 k$$\Omega $$
7.9 k$$\Omega $$
Explanation
ig = 1 mA , Rg = 100 $$\Omega $$
V = ig(R + Rg)
$$ \Rightarrow $$10 = 1 Ć 10ā3 (R + 100)
$$ \Rightarrow $$R = 9.9 k$$\Omega $$
V = ig(R + Rg)
$$ \Rightarrow $$10 = 1 Ć 10ā3 (R + 100)
$$ \Rightarrow $$R = 9.9 k$$\Omega $$
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