CAPE Physics Unit 1 · 2009 · Paper 1 · Question Q36
An insulated composite metal rod consists of 30\text{ cm} of Metal A with a conductivity of 300\text{ W m}^{-1}\text{ K} and 30\text{ cm} of Metal B with a conductivity of 200\text{ W m}^{-1}\text{ K}.
An insulated rod of Metal A of length L conducts heat at the same rate as the composite bar when it has the same temperatures \theta_1 and \theta_2 at its ends. L is equal to
- (A)
40\text{ cm} - (B)
50\text{ cm} - (C)
60\text{ cm} - (D)
75\text{ cm}
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