Question

3) An electron and a proton are 1.0×10−6 m. apart. Calculate the force between them in Newtons, and whether it’s attractive or repulsive:

a. 2.3×10−8 N, repulsive

b. 2.3×10−10 N, attractive

c. 2.3×10−12 N, repulsive

d. 2.3×10−16 N, attractive

4. Which of the following differs from the others with respect to electricity

a. plastic

b. iron

c. glass

d. ceramic

5) A magnetic field is produced by

a. static negative charges

b. static positive charges

c. flowing water

d. an electric current

Answer 1

3)

F = kq1q2 / r²

F = 9e9 * 1.6e-19 * 1.6e-19 / (1e-6)²

F = 2.3e-16 N

as both charges are opposite, there will be attraction !!

_____________________

4)

I think iron is the only thing which is different and is a conductor

_______________

5)

static charges can never produce magnetic fields

so,

correct answer - an electric current ( moving electrons)