BITSAT2012PhysicsElectrostaticsActual
The electric field intensity just sufficient to balance the earth's gravitational attraction on an electron will be: (given mass and charge of an electron respectively are 9.1 10⁻³¹ ~kg and 1.6 .10⁻¹⁹ C . )
Options
- A-5.6 10⁻¹¹ ~N / C
- B-4.8 10⁻¹⁵ ~N / C
- C-1.6 10⁻¹⁹ ~N / C
- D-3.2 10⁻¹⁹ ~N / C
Correct answer
A. -5.6 10⁻¹¹ ~N / C
Step-by-step solution
- eE = mg E =- 9.1 10⁻³¹ 10 1.6 10⁻¹⁹ =-5.6 10⁻¹¹ ~N / C