Question

A voltmeter of range 2 $V$ and resistance 300$\Omega$ cannot be converted into ammeter of range:

• A. $1A$
• B. $1mA$
• C. $100mA$
• D. $10mA$

Answer 1

The correct option is B $1mA$

$I_g=\frac{2}{300}A$
$=\frac{2}{300}\times 1000mA$
$=\frac{20}{3}mA$
$I_g=6.67mA$
As range of ammeter cannot be decreased by can be increased only, therefore, the instrument cannot be converted to measure the range $1mA$.