# Question #89b77

##### 2 Answers

The 'line' is an arrow, meaning the field is a vector.

#### Explanation:

A vector has both size (or magnitude) and direction. As a field can point in different directions this information is also important.

The equation says that the electric field **divided by** (the charge, q, of the test charge).

#### Explanation:

The definition of electric field from my copy of

If a positive test charge

#q_o# is placed at point P and if an (electric) ForceFacts on the stationary charge, an electric fieldEis present at P, whereEis the vector satisfying the relation

F=#q_o# E

The Equation of the pic you included, with your symbols, is

That equation is equivalent to the equation above from my college textbook.

- The
#vecE# is the electric field. The units of#vecE# are Newtons/Coulomb. - The
#vecF_E# is the force that acts on a test charge due to the electric field it finds itself in. The unit of#vecF_E# is Newtons. - The
#q# is the charge on the test charge. The unit of q is Coulombs.

I hope this helps,

Steve