Which of the following circular rods,(given radius r and length l)each made of the same material and whose ends are maintained at the same temperature will conduct most heat?
- r = 2r0 ; I=2l0
- r = 2r0 ; l=l0
- r = r0 ; l= l0
- r = r0 ; l=2l0
The Correct Option is B
Solution and Explanation
Heat=KA \(\triangle \,\theta_x\)
=K\(\pi\)r2\(\frac{\triangle \,\theta}{1}\)
For option B the value of H will be more.
Therefore, the correct option is (B): r = 2r0 ; l=l0
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Concepts Used:
Conductance
What is conductance?
Conductance is an expression of the ease with which electric current flows through materials like metals and nonmetals. In equations, an uppercase letter G symbolizes conductance. The standard unit of conductance is siemens (S), formerly known as mho.
What is conductance in electricity?
Conductance in electricity is considered the opposite of resistance (R). Resistance is essentially the amount of friction a component presents to the flow of current.
The conductivity of electrolytic solutions is governed by the following factors:
- Interionic attraction
- Solvation of ions
- The viscosity of the solvent
- Temperature