Question

A tangent Galvanometer has a reduction factor of $1A$ and it is placed with the plane of its coil perpendicular to the magnetic meridian. The deflection produced when a current of $1A$ is passed through it is

• A. 60${}^{\circ }$
• B. 45${}^{\circ }$
• C. 30${}^{\circ }$
• D. None of these

Answer 1

Answer: (B)

Deflection in tangent galvanometer
$\tan \theta =\frac{I}{K}$
where $K=$ reduction factor
$\tan \theta =\frac{1}{1}=1=\tan 45^{\circ }$
$\therefore \theta =45^{\circ }$