To know the resistance G of a galvanometer by half deflection method, a battery of emf VE and resistance R is used to deflect the galvanometer by angle θ . If a shunt of resistance S is needed to get half deflection then G , R and S are related by the equation:
a. S(R+G)=RG
b. 2S(R+G)=RG
c. 2G=S
d. 2S=G