The specimen is taken in the form of 'disc' in Lee's disc method to find the thermal conductivity is a bad conductor. Why?

The specimen is taken in the form of 'disc' in Lee's disc method to fi

1.	The specimen is taken in the form of 'disc' in Lee's disc method to find the thermal conductivity is a bad conductor. Why?
Answer» SOLUTION :Then the surface area A will be large with a SMALL VALUE for THICKNESS.