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Tanzania [10]
3 years ago
6

An electron initially 3.00 m from a nonconducting infinite sheet of uniformly distributed charge is fired toward the sheet. The

electron has an initial speed of 420 m/s and travels along a line perpendicular to the sheet. When the electron has traveled 2.00 m, its velocity is instantaneously zero, and it then reverses its direction. What is the surface charge density on the sheet?
Physics
1 answer:
Cloud [144]3 years ago
5 0

Answer:

4.4443704375\times 10^{-18}\ C/m^2

Explanation:

\epsilon_0 = Permittivity of free space = 8.85\times 10^{-12}\ F/m

\Delta l = Distance charge traveled = 2 m

v = Velocity of electron = 420 m/s

E = Electric field

m_e = Mass of electron = 9.11\times 10^{-31}\ kg

q_e = Charge of electron = 1.6\times 10^{-19}\ C

As the energy of the system is conserved we have

q_eE\Delta l=\dfrac{1}{2}m_ev^2\\\Rightarrow E=\dfrac{1}{2}\dfrac{m_e}{q_e}\times \dfrac{v^2}{\Delta l}\\\Rightarrow E=\dfrac{1}{2}\dfrac{9.11\times 10^{-31}}{1.6\times 10^{-19}}\times \dfrac{420^2}{2}\\\Rightarrow E=2.51094375\times 10^{-7}\ N/C

For an infinite non conducting sheet electric field is given by

E=\dfrac{\sigma}{2\epsilon}\\\Rightarrow \sigma=2E\epsilon\\\Rightarrow \sigma=2\times 2.51094375\times 10^{-7}\times 8.85\times 10^{-12}\\\Rightarrow \sigma=4.4443704375\times 10^{-18}\ C/m^2

The surface charge density is 4.4443704375\times 10^{-18}\ C/m^2

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