Topic 7 - Electric And Magnetic Fields

Topic 7

Electric Field Strength (E)

Force Per Unit Charge Experienced By An Object In An Electric Field. Value Is Constant In A Uniform Field But Varies In A Radial Field. Distance Between Field Lines Represents The Strength Of The Force Exerted By The Field In That Region.

Electric Field

Force Field In Which Charged Particles Experience A Force.

E=F/Q

F Is Force Exerted, E Is Electric Field Strength And Q Is The Charge Of The Object

Force Field

An Area In Which An Object Experiences A Non-Contact Force. Can Be Represented As Vectors Or Field Lines.

Coulombs Law

States That The Magnitude Of The Force Between Two Point Charges Is Directly Proportional To The Product Of Their Charges, And Inversely Proportional To The Square Of The Distance Between Them.

Coulombs Law Symbols

ε₀ Is The Permittivity Of Free Space, Q1/Q2 are Charges, And r Is The Distance Between Charges.

Charge Attraction

If Charge Have Same Sign The Force Will Be Repulsive, And If Chargers Have Different Signs The Force Will Be Attractive.

Electric Field Strength In A Radial Field

Point Charges Form A Radial Electric Field, You Can Calculate Electric Field Strength In A Radial Field By Using This Formula, Where ε₀ Is The Permittivity, Q Is The Charge, And R Is the Distance From The Centre Of The Charge To The Point Of Interest.

Absolute Electric Potential (V)

Potential Energy Per Unit Charge Of A Positive Point Charge At That Point In The Field. Magnitude Greatest At The Surface Of A Charge, And As Distance Increases, PD Decreases, So Electric Potential At Infinity Is 0.

Value Of Potential

Whether Potential Is + Or - Depends On The Sign Of Charge. If Charge Is +, Then Potential Is + And Charge Is Repulsive. When The Charge Is -, Potential Is - And Force Is Attractive.

Electric Field Between Parallel Plates

You Can Calculate The Electric Field Strength (E) In An Electric Field Formed Between Parallel Plates By Dividing The Potential Difference Across The Plates By The Distance Between Them. Where V Is Potential Difference Across The Parallel Plates, And d Is The Distance Between Them.

Electric Potential In Radial Field

To Find Electric Potential In Radial Field Use This Formula, Where ε₀ Is Permittivity Of Free Space, Q Is The Charge, and r Is The Distance Between Charges.

Electric Potential Difference (V)

Energy Needed To Move A Unit Charge Between 2 Points.