Question

When a \(15\,\Omega\) resistor is connected in parallel to a galvanometer, its deflection becomes one-fourth. Then the resistance of the galvanometer is

• A. \(45\,\Omega\)
• B. \(60\,\Omega\)
• C. \(15\,\Omega\)
• D. \(30\,\Omega\)

Hint:

For a galvanometer with shunt, \[ \boxed{ \frac{I_s}{I_g} = \frac{R_g}{R_s}. } \] Also, \[ \boxed{\text{Deflection}\propto I_g.} \] A decrease in deflection directly indicates a decrease in the current through the galvanometer.

Answer 1

The Correct Option is A