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Mixed Combination of Cells

A milliammete...

Question

A milliammeter of range $10 m A$ and resistance $9 Ω$ is joined in a circuit as shown. The metre given full-scale deflection for current $l$ when $A$ and $B$ are used as its terminals, i.e., current enters at $A$ and leaves at $B .$ The value of $I$ is

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Solution

Voltage is same in both milliam meter & resistance of $0.1$ $A$ .
$∴$ $I \times 0.1 = 10 m A \times 9$
$I = 90 m A$
$I = 0.9 A$

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