Crompton potentiometer has
A. 14 coils and a slide wire all having the same resistance
B. 14 coils and a slide wire but the resistance of slide wire is half that of each coil
C. 14 coils each of different resistance
D. 14 coils out of which 7 coils have resistance which is twice that of remaining 7 coils
Share your understanding of this question with the correct explanation.