Consider two infinitely long thin concentric tubes of circular cross section as shown in the figure. If $D_{1}$ and $D_{2}$ are the diameters of the inner and outer tubes respectively, then the view factor $F_{22}$ is given by

(A) $\left(\frac{D_{2}}{D_{1}}\right)-1$

(B) zero

(C) $\left(\frac{D_{1}}{D_{2}}\right)$

(D)$1-\left(\frac{D_{1}}{D_{2}}\right)$

Consider two infinitely long thin concentric tubes of circular cross section as shown in the figure. If $D_{1}$ and $D_{2}$ are the diameters of the inner and outer tubes respectively, then the view factor $F_{22}$ is given by

(A) $\left(\frac{D_{2}}{D_{1}}\right)-1$

(B) zero

(C) $\left(\frac{D_{1}}{D_{2}}\right)$

(D)$1-\left(\frac{D_{1}}{D_{2}}\right)$

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