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  4. An ammeter has a resistance of 0.1 Ω. It can read upto 5 A. To convert this into voltmeter to read 100 V, the resistance to be used is

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Q. An ammeter has a resistance of $0.1 \Omega$. It can read upto $5 \, A$. To convert this into voltmeter to read $100 \, V$, the resistance to be used is

COMEDKCOMEDK 2006Moving Charges and Magnetism

Solution:

Here,
$V= I (R_A+ R)$
or, $100 = 5 (0.1 + R)$
or, $R = (20- 0.1)$
$\Rightarrow \, R = 19.9 \, \Omega$

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