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  4. If reduction factor of a tangent galvanometer is 900 mA, then the current through it to produce a deflection of 45° is

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Q. If reduction factor of a tangent galvanometer is $900 \,mA$, then the current through it to produce a deflection of $ 45^{\circ} $ is

AMUAMU 2005Magnetism and Matter

Solution:

Current $(I)$ flowing in a tangent galvanometer is given by
$I=k \tan \theta \text {. }$
Given, $k$ is reduction factor
$\left(k=900 mA =900 \times 10^{-3} A \right), \theta=45^{\circ} $
$\therefore I=900 \times 10^{-3} \times \tan 45^{\circ} $
$\Rightarrow I=900 \,mA$