Answer:
Final velocity of electron,
Explanation:
It is given that,
Electric field, E = 1.55 N/C
Initial velocity at point A, ![u=4.52\times 10^5\ m/s](https://tex.z-dn.net/?f=u%3D4.52%5Ctimes%2010%5E5%5C%20m%2Fs)
We need to find the speed of the electron when it reaches point B which is a distance of 0.395 m east of point A. It can be calculated using third equation of motion as :
........(1)
a is the acceleration, ![a=\dfrac{F}{m}](https://tex.z-dn.net/?f=a%3D%5Cdfrac%7BF%7D%7Bm%7D)
We know that electric force, F = qE
![a=\dfrac{qE}{m}](https://tex.z-dn.net/?f=a%3D%5Cdfrac%7BqE%7D%7Bm%7D)
Use above equation in equation (1) as:
![v^2=u^2+\dfrac{2qEs}{m}](https://tex.z-dn.net/?f=v%5E2%3Du%5E2%2B%5Cdfrac%7B2qEs%7D%7Bm%7D)
![v^2=(4.52\times 10^5\ m/s)^2+2\times \dfrac{1.6\times 10^{-19}\ C\times 1.55\ N/C}{9.1\times 10^{-31}\ kg}\times 0.395\ m](https://tex.z-dn.net/?f=v%5E2%3D%284.52%5Ctimes%2010%5E5%5C%20m%2Fs%29%5E2%2B2%5Ctimes%20%5Cdfrac%7B1.6%5Ctimes%2010%5E%7B-19%7D%5C%20C%5Ctimes%201.55%5C%20N%2FC%7D%7B9.1%5Ctimes%2010%5E%7B-31%7D%5C%20kg%7D%5Ctimes%200.395%5C%20m)
v = 647302.09 m/s
or
![v=6.45\times 10^5\ m/s](https://tex.z-dn.net/?f=v%3D6.45%5Ctimes%2010%5E5%5C%20m%2Fs)
So, the final velocity of the electron when it reaches point B is
. Hence, this is the required solution.
Answer:
creo que es la a ..........
Answer:
Explanation:
Situations in which an electron will be affected by an external electric field but will not be affected by an external magnetic field
a ) When an electron is stationary in the electric field and magnetic field , he will be affected by electric field but not by magnetic field. Magnetic field can exert force only on mobile charges.
b ) When the electron is moving parallel to electric field and magnetic field . In this case also electric field will exert force on electron but magnetic field field will not exert force on electrons . Magnetic field can exert force only on the perpendicular component of the velocity of charged particles.
Situations when electron is affected by an external magnetic field but not by an external electric field
There is no such situation in which electric field will not affect an electron . It will always affect an electron .