Question

A 50 ohm resistance galvanometer can read up to 10mA. what is the value of shunt required yo increase its range to 1 ampere.

• A. $0.50505\Omega$
• B. $5.0505\Omega$
• C. $50.505\Omega$
• D. $505.05\Omega$

Answer 1

The correct option is A $0.50505\Omega$

Given: $R_g=50\Omega$ //galvanometer resistance//

$I_g=10mA=0.01A$ //galvanometer current reading max//

$I=1A$

To Find: $shunt$ $resistance,R_s=?$

Solution: As we know,

$R_s=\frac{I_g}{I-I_g}\ast R_g$

substitute required values

$R_s=\frac{0.01}{1-0.01}\ast 50$

$R_s=\frac{0.5}{0.99}$

$R_s=0.50505\Omega$

hence,

The correct opt:A