A milliammeter of range 10 mA has a coil of resistance 1 Ω. To use it as an ammeter of range 1 A, the required shunt must have a resistance of

Question

A milliammeter of range 10 mA has a coil of resistance 1 Ω. To use it as an ammeter of range 1 A, the required shunt must have a resistance of (A) (1/101) Ω (B) (1/100) Ω (C) (1/99) Ω (D) (1/9) Ω

Tardigrade Admin · Accepted Answer

S=(ig G/(I-ig))=(0.01 × 1/1-0.01)=(1/99) Ω

Q. A milliammeter of range $10 m A$ has a coil of resistance $1 Ω$ . To use it as an ammeter of range $1 A$ , the required shunt must have a resistance of

$\frac{1}{101} Ω$

$\frac{1}{100} Ω$

$\frac{1}{99} Ω$

$\frac{1}{9} Ω$

$S = \frac{i _{g} G}{( I - i _{g} )} = \frac{0.01 \times 1}{1 - 0.01} = \frac{1}{99} Ω$

Q. A milliammeter of range 10mA has a coil of resistance 1Ω. To use it as an ammeter of range 1A, the required shunt must have a resistance of

1011​Ω

1001​Ω

991​Ω

91​Ω