A test charge of - 1.4 * 10-7 coulomb experience a force of 5.4 * 10^-1 Newtons. calculate the magnitude of the electric field created by the negative test charge.

Charge (q) = - 1.4 x 10^-7 Coulombs

Force (F) = 5.4 x 10^-1 Newtons

Electric Field (E) = ?

Force = Charge x Electric Field

F = |q| x E

E = F / |q|

E = Newton/Coulomb < - Electric Field Unit

-> E = 5.4 x 10^-1 / |-1.4 x 10^-7|

-> E = 5.4 x 10^-1 / 1.4 x 10^-7

-> E = 3.857 x 10^ (-1 - (-7))

-> E = 3.86 x 10^ (-1+7)

-> E = 3.86 x 10^6 N/C

Answer: The magnitude of the electric field created is 3.86 x 10^6 N/C.