An infinitely long straight consuctor carries a current of 5A as shown. An electron is moving with a speed of `10^5 m/s` parallel to the conductor. The perpendicular distance between the electron and the conductor is 20cm at an instant. Calculate the magnitude of the force experienced by the electron at that instant.

Options

A. `8 pi xx 10^(-20)` N
B. `4 pi xx 10^(-20) `N
C. `8 xx 10^(-20)` N
D. `4 xx 10^(-20)` N

Answer

C

Explanation

`f = ev ((mu_(0) i)/(2pi r))`
`f = (1.6 xx 10^(-19) xx 10^(5) xx 2 xx 10^(-7) xx 5)/(0.2)`
`f = 8 xx 10^(-20)` Newton