1.

Consider the diagram. When is the formula Φf=gfΦF+(1-gf)Φc; gf=\(\frac{distance_{cf}}{distance_{cf}+distance_{fF}}\) valid?

A. Only if Φ varies linearly
B. Only if Φ varies quadratically
C. Only if Φ varies cubically
D. Always
Answer» B. Only if Φ varies quadratically


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