What is the null / neutral point in an electric field?
A point between two like-charges where the gravitational field strength is zero.
What does the direction of electric field lines show?
Force felt by a positive test charge in an electric field (positive to negative).
What is an electric field?
Region where a charged object will experience a force.
What does a positive charge mean in terms of electrons?
Lack of electrons.
What does the ‘Q’ in the radial electric field strength equation represent?
Charge of object causing the field.
What is electric field strength?
Force per unit charge of an object in an electric field.
What does a negative charge mean in terms of electrons?
Excess of electrons.
What is Coulombs Law?
Force between two charges is:
- Proportional to the product of the charges.
- Inversely proportional to the square of the distance between them.
What is electric potential?
Work done per unit positive charge on a positive test charge when it is moved from infinity to that point in the field.
What happens to the electric potential if the field is negatively charged and why?
Potential is negative because it will be doing work to get to infinity.
What is the gradient of a graph of electric potential against distance?
Electric field strength.
What is the area under a graph of electric field strength against distance?
Electric potential.
What are equipotential lines?
Lines that connect points of the same potential.
What lines are always perpendicular to field lines?
Equipotential lines.
How much work is done moving across equipotential lines?
0 J
