To review relationships among electric potential, electric potential energy, and force on a test charge
This problem is a review of the relationship between an electric field E? , its associated electric potential V, the electric potential energy U, and the direction of force on a test charge.
Part A
Electric field lines always begin at charges (or at infinity) and end at charges (or at infinity). One could also say that the lines we use to represent an electric field indicate the direction in which a test charge would initially move when released from rest. Which of the following fills in the three missing words correctly?
(positive; negative; negative)__
(positive; negative; positive)__
(negative; positive; negative)__
(negative; positive; positive)__

positive, negative, positive

Explanation:

Electric field lines are the imaginary lines that is the path followed by an isolated unit positive charged particle in an electric field.

The direction of electric field at that point is determined by drawing the tangent at that point on the electric field line.

Part A

The electric field lines always begin at positive charges and end at negative charges.

One could also say that the lines we use to represent an electric field indicate the direction in which a positive test charge would initially move when released from rest.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.