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				| 1. | 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)²/4BWhat 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) | 
| Answer» B. (q g) (δ)³/3k (T W1 – TW2) | |