The thermal emf of any two metals in a homogeneous medium corresponding to third/other metal

Q.  According to the law of intermediate metals, the thermal emf of any two metals in a homogeneous medium corresponding to third/other metal is nothing but equal to algebraic _______
- Published on 21 Oct 15

a. Sum of individual e.m.fs w.r.t third/ another homogeneous metal
b. Difference of individual e.m.fs w.r.t third /another homogeneous metal
c. Sum of individual e.m.fs w.r.t third / another heterogeneous metal
d. Difference of individual e.m.fs w.r.t third / another heterogeneous metal

ANSWER: Sum of individual e.m.fs w.r.t third/ another homogeneous metal

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