A rod of length 20 cm is made of metal. It expands by 0.075 cm when its temperature is raised from $0^{o} C$ to $100^{o} C$ . Another rod of the different metal B having the same length expands by 0.045 cm for the same change in temperature. A third rod of the same length is composed of two parts, one of metal A and the other of metal B. This rod expands by 0.060 cm for the same change in temperature. The portion made of metal A has the length $2 n$ cm. The value of $n$ is

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Detailed Solution

Here $\frac{0.075 \times 0.045}{2} = 0.060$
This is possible each part is 10cm long

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