Question

An electron is a negatively charged particle that has a charge of magnitude, e - 1.60 x 10-19 C. Which one of the following statements best describes the electric field at a distance r from the electron? The electric field is directed toward the electron and has a magnitude of ke/r. The electric field is directed away from the electron and has a magnitude of ke/2. The electric field is directed toward the electron and has a magnitude of ke/? The electric field is directed toward the electron and has a magnitude of ke?/r. The electric field is directed away from the electron and has a magnitude of ke/r.

Answer 1

Step-by-step explanation:

The charge on the electron is,
`q=-1.6* 10^(-19)\ C`

The electric field at a distance r from the electron is :

`E=k(q)/(r^2)`

Where

k is the electrostatic constant,
`k=(1)/(4\pi \epsilon_o)`

We know that the electric field lines starts from positive charge and ends at the negative charge. Also, for a positive charge the field lines are outwards while for a negative charge the field lines are inwards.

So, the correct option is " the electric field is directed toward the electron and has a magnitude of
`k(q)/(r^2)`. Hence, this is the required solution.