35. ​Two Cells in series give a deflection of  60 °  when connected to a tangent galvanometer and the cells aid each other. The deflection reduce to  30 ° when  the cells oppse each other. The ratio of emf's of  the cells in order is:
 
a. 1: 2

b. 2:1

c. 3:1

d. 1: 3
 

Dear Student ,
As we know that in case of tangent galvanometer we can write that ,
emf , etanθe1e2=tanθ1tanθ2=tan60°tan30°=313=31e1:e2=3:1
So the correct option is c .
Regards

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