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Transmission of Heat — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsTransmission of Heat1 Mark
MCQ
Two identical plates of different metals are joined to form a single plate whose thickness is double the thickness of each plate. If the coefficients of conductivity of each plate are 2 and 3 respectively, then the conductivity of composite plate will be
  • A
    5
  • ✓
    2.4
  • C
    1.5
  • D
    1.2
✓

Answer

Correct option: B.
2.4
(b) Thermal conductivity of composite plate$K_{e q}=\frac{2 K_1 K_2}{K_1+K_2}=\frac{2 \times 2 \times 3}{2+3}=\frac{12}{5}=2.4$

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