(7.1) - Fields Flashcards
(10 cards)
1
Q
What is a field?
A
A region where a body experiences a non-contact force. Represented as a vector
2
Q
What 3 interactions cause force fields to arise?
A
- Mass (gravitational)
- Static charge (electric)
- Moving charge (magnetic)
3
Q
4 Similarities of Gravitational and Electrostatic Forces
A
- Inverse-square law (F∝1/r^2)
- Both use field lines to show direction/magnitude
- Use of potential concept
- Equipotential surface
4
Q
1 Difference of Gravitational and Electrostatic Forces
A
- Gravitational is always attractive, Electrostatic can attract or repel
5
Q
What is the potential concept?
A
Work done for every kilogram of mass to said mass from infinity to a point in a field.
6
Q
When a force is attractive, what sign would it have?
A
Negative
7
Q
What is Vg at infinity?
A
0
8
Q
What happens as r decreases?
A
Vg decreases
9
Q
What are equipotential surfaces?
A
Area in field where it can be said g is the same. No work needed to move object between two points of surface. Not realistic
10
Q
What do tighter lines in a field show?
A
Stronger field strength
