Question

The electric field that is 0.25m from a small sphere is 450n/c toward the sphere.

a. Is the charge positive or negative? Why?
b. What is the magnitude of the charge on the sphere?

Answer 1

its b bc its the volume of the sphere 

Answer 2

PART 1)

A small sphere is considered to be a point charge

So here if electric field is indicating the position of charge itself or it is towards the charge then it must be a negative charge on the sphere

PART 2)

Electric field due to a point charge is given by

`E = (KQ)/(r^2)`

here

`k = 9 * 10^9`

`Q = charge`

`r` = distance of charge from the point where field strength is required

= 0.25 m

`E = 450 N/c`

now from the above equation we can say

`450 = (9*10^9 * Q)/(0.25^2)`

`Q = 3.125 * 10^(-9) C`

So magnitude of charge is 3.125 nC on the small sphere