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Two cylinders P and Q have the same le...

Two cylinders P and Q have the same length and diameter and are made of different materials having thermal conductivities in the ratio 2 : 3. These two cylinders are combined to make a cylinder. One end of P is kept at `100° C` and another end of Q at `0° C` . The temperature at the interface of P and Q is

A

`40^@C`

B

`50^@C`

C

`60^@C`

D

`70^@C`

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The correct Answer is:
A
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