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Q.
Unit of reduction factor is:
Physical World, Units and Measurements
Solution:
In a suspended coil galvanometer the strength of current is not proportional to the deflection $ \text{o }\!\!|\!\!\text{ } $ hence, cannot be read directly. To remove this difficulty the field is made radial. Hence, deflecting torque on the coil suspended in radial magnetic field is $ NiAB $ where N is number of turns in coil, A is area of plane of coil and B is magnetic field. $
NiAB = C $ $\phi $
$ \Rightarrow i = \frac{ C}{ NAB } \phi \Rightarrow i = K \phi $
where K is a constant called reduction factor. Its unit is same as of current that is ampere.