Calculate the force experienced by a positive test charge of 8.1 × 10-9 coulombs if the electric field strength is 9.4 × 107 newtons/coulomb.
a.
1.5 × 10-1 newtons
b.
9.4 × 10-7 newtons
c.
7.6 × 10-1 newtons
d.
8.7 × 10-1 newtons

C.  

7.6 × 10-1 newtons

Explanation:

The electrostatic force experienced by a charge is given by

where

q is the magnitude of the charge

E is the magnitude of the electric field

In this problem, we have

is the charge

is the electric field

Substituting into the formula, we find

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

cant without the picture! ?