Flashcards
A2 Physics Coloumb's Law
Cards in this deck (14)
- 1Electric field of a chargeThe space around the charge in which an electric force due to that charge is experienced
Direction of field lines show the direction of the field - always positive to negative
Higher density of lines shows a stronger region of field - 2Coulomb's lawAny two point charges exert an electrical force on each other that is proportional to the product of their charges and inversely proportional to the square of their separation
- 3Electric field strengthForce per unit positive charge
- 4Coulomb's law equation
- 5How to calculate electric field strength
- 6Electric potentialElectric potential at a point is the work done in bringing a unit positive charge from infinity to that point
- 7How to calculate the electric potential
- 8Potential differenceThe potential difference between two points A and B from an isolated charge Q is defined as work done in taking a unit positive charge from B to A
- 9Scenarios of electric potentialIf positive charge moved in direction of electric field, its electric potential energy will decrease
If negative charge moved in direction of electric field, its electric potential energy will increase
If charge accelerated in the field, its electrical potential energy will be converted into kinetic - 10Features of potential due to a conducting sphereA charge Q+ on an isolated conducting sphere is uniformly distributed over its surface
Charge remains on surface and at all points inside the sphere, the field strength is 0
The electric potential inside the sphere is the same at all points - 11Equipotential surfaceA surface where the electric potential is constant
Equipotential lines are drawn such that potential is constant between intervals
As potential constant, the potential gradient is 0 so E along the surface is 0
Hence no work is done when a charge is moved along this surface - 12Diagram of equipotentialElectric field lines must meet equipotential surface at right angles
- 13Similarities between Electric and Gravitational potentialRatio of work done to mass/charge
Work done moving unit mass/charge from infinity
Both have zero potential at infinity - 14Differences between Electric and Gravitational potentialGravitational forces are always attractive
Electric forces can be attractive or repulsive
For gravitational, work got out as masses come together
For electric, work done on charges if same sign, work got out as charges come together
Information
- Description
- AS level Physics Flashcards on A2 Physics Coloumb's Law, created by Sean Byrne on 15/02/2018.
- Created by
- Sean Byrne
- Views
- 1
- Rating
More on Electric Potential and Potential Energy