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Que. In case when both the surfaces of plane wall are at different temperature, we get an expression i.e.

T MAX – T W2 /T W1 – TW2 = (B + 1)²/4B

What is the value of B?
a. (q g) (δ)²/2k (T W1 – TW2)
b. (q g) (δ)³/3k (T W1 – TW2)
c. (q g) (δ)⁴/4k (T W1 – TW2)
d. (q g) (δ)⁵/5k (T W1 – TW2)
Correct Answer:(q g) (δ)²/2k (T W1 – TW2)
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