NEET2019PhysicsCurrent ElectricityActual
If resistivity of copper is 1.72 10⁻⁸ - m and number of free electrons in copper is 8.5 10²⁸ / m ^3 . Find the mobility.
Options
- A4.25 10⁻³ ~m ^2 / C
- B6.8 10⁻³ ~m ^2 / C
- C8.5 10⁻³ ~m ^2 / C
- D3.4 10⁻³ ~m ^2 / C
Correct answer
A. 4.25 10⁻³ ~m ^2 / C
Step-by-step solution
Given, Resistivity of copper =1.72 10⁻⁸ - m Electrons density n =8.5 10²⁶ / m ^3 aligned Mobility ( ) & = 1 ne & = 1 1.72 10⁻⁸ 8.5 10²⁸ 1.6 10⁻¹⁹ & =4.25 10⁻³ ~m ^2 / C aligned