Question

Two tangent galvanometer A and B are identical except in their number of turns. They are connected in series. On passing a current through them, deflections of `60^(@) and 30^(@)` are produced. The ration of the number of turns in A and B is
A. `1:3`
B. `3:1`
C. `1:2`
D. `2:1`

Answer 1

As the current and the other factors are sence same for both the galvonometers, so
`N alpha tan theta Rightarrow (N_(1))/(N_(2))=(tan 60^(@))/(tan 30^(@)) or (N_(1))/(N_(2))=(sqrt3)/(1//sqrt3)=3:1`