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CBSE Class 11-science Answered

<div>A cylinder is made up of materials having thermal conductivity K. If it is coated upto thrice of its radius of a material of thermal conductivity k, then the equivalent thermal conductivity will be</div> <div>1. (K + k)/ 2</div> <div>2. 2Kk/ (K + k)</div> <div>3. (K + 3k)/4</div> <div>4.&nbsp;(K + 8k)/9</div>
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