The thermal conductivity of the plate depends upon

the temperature difference between the two sides

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the thickness of the plate

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the area of the plate

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nature of the material

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Solution

The correct option is C nature of the material
Thermal conductivity of any object depends solely on the material of the object.
It is an intrinsic property and is independent on dimensions/mass/etc of the body.
For example, all iron rods will have same thermal conductivity.
All copper rods will have same thermal conductivity.
But, thermal conductivity of iron rod will be different from that of copper rod.

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Similar questions

Q. Two metal plates of same area and thickness

l_{1}

and

l_{2}

are arranged in series. If the thermal conductivities of the materials of the two plates are

k_{1}

and

k_{2}

. The thermal conductivity of the combination is :

Two plates of the same area and the same thickness having thermal conductivities $k_{1}$ and $k_{2}$ are placed one on top of the other. The top and bottom faces of the composite plate are maintained at different constant temperatures. The thermal conductivity of the composite plate will be