The electric field at a point in space is defined as the force per unit charge a

Question

The electric field at a point in space is defined
as the force per unit charge at that point in
space. We can write the electric field E of
a charge q at a distance d from that charge,
experienced by a charge Q, as
E =F/Q= k(q/d^2) .
The electric field has a direction such that it
points toward negative charges and away from
positive charges. Suppose your rub a balloon
in your hair and it acquires a static charge of
-1 × 10^-9 C.
What is the magnitude of the electric field
created by the balloon at a location 1 m due
north of the balloon? Coulomb’s constant is
9 × 10^9 N · m^2/C^2.
Answer in units of N/C

Explanation / Answer

E=Kq/r^2=9 × 10^9 N *-1 × 10^-9 C./1^2=9 N/C

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