<e> a) A rod of length 𝐿 has its ends 𝐴 and 𝐵 maintained at 20 °𝐶 and 40 °𝐶 respectively
until steady state condition prevail. The temperature at 𝐴 is suddenly raised to
50 °𝐶 while that at 𝐵 is lowered to 10 °𝐶 and maintained thereafter. Find the
subsequent temperature distribution of the rod.
b) Solve (𝑥
2 − 𝑦
2 − 𝑧
2
)𝑝 + (2𝑥𝑦) 𝑞 = 2𝑥𝑧 where 𝑝 =
𝜕𝑧
𝜕𝑥 , 𝑞 =
𝜕𝑧
𝜕𝑦
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