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Standard XIII

Physics

Ammeter

A milliammete...

Question

A milliammeter of range $10 mA$ and resistance $9 Ω$ is joined in a circuit as shown. The meter gives full scale deflection for current $I$ when $A$ and $B$ are used as its terminals. i.e., current enters at $A$ and leaves at $B$ ( $C$ is left isolated). The value of $I$ is

100 mA

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900 mA

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1 A

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1.1 A

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Solution

The correct option is C $1 A$
In parallel, current distributes in inverse ratio of resistance.
$\Rightarrow \frac{0.01}{I - 0.01} = \frac{0.1}{9 + 0.9}$

Solving we get $I = 1 A$
Hence, the correct answer is (C).

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A milliammeter of range 10 mA and resistance 9 Ω is joined in a circuit as shown. The meter gives full scale deflection for current I when A and B are used as its terminals. i.e., current enters at A and leaves at B (C is left isolated). The value of I is

The correct option is C 1 AIn parallel, current distributes in inverse ratio of resistance. ⇒0.01I−0.01=0.19+0.9 Solving we get I=1 A Hence, the correct answer is (C).

A milliammeter of range $10 mA$ and resistance $9 Ω$ is joined in a circuit as shown. The meter gives full scale deflection for current $I$ when $A$ and $B$ are used as its terminals. i.e., current enters at $A$ and leaves at $B$ ( $C$ is left isolated). The value of $I$ is

The correct option is C $1 A$
In parallel, current distributes in inverse ratio of resistance.
$\Rightarrow \frac{0.01}{I - 0.01} = \frac{0.1}{9 + 0.9}$

Solving we get $I = 1 A$
Hence, the correct answer is (C).