1.

2. 2:1Two identical plates of metal are welded end to end asshown in figure (A), 20 cal of heat flows through it in 4min. if the plates are welded as shown in figure (B), thesame amount of heat will flow through the plates inA)wo.xxOBRKKX2. 2 min3.4 min4. 16 min

Answer»

dq/dt = [(AK)/2x][T2-T1] = 20/4 = 5. Therefore( AK/x)(T2-T1) = 10

When they are one above the other,

dq/dt = 2Ak/x][T2-T1] =20/t

Therefore t = 2×10 = 20/t

Therefore t = 1 min



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