Flashcards
Physics- Electric and Magnetic Fields
Cards in this deck (9)
- 1Define Electric FieldAn electric field is any region in space where a charged particle experiences a force.
- 2Define Electric Field Strength (units)Force per unit positive test charge placed at that point in the field.
Units: Newtons per Coulomb or NC^-1 - 3Direction of the Electric Field: 1) when the charge is positive 2) When the charge is negativeIf the charge is positive, Electric field is in the same direction as the Force
(ie: parallel)
If the charge is negative, Electric Field is in the opposite direction to the Force
(ie: anti-parallel - 4Coulomb's LawThere exists a force between any two charges. The magnitude of the force is directly proportional to the product of the charges (ie F∝ q X q)
and inversely proportional to the square of the distance. (ie F ∝ 1/r^2) - 5Force is directly proportional: F ∝ q X q what would happen to the force if you double one of the charges?If you double one of the charges, the force between the charges will double and Halving a charge will halve the force.
- 6Force is inversely proportional: F ∝ 1/r^2) What would happen to the force, if you double the distance between the charges?If you double the distance between the charges, the force between will be a quarter of the original force.
- 7Why isn't Electric Field present inside a hollow conductor?There is no Electric Field inside a hollow conductor because all charges reside on the outside of the conductor as the surface area is greater and therefore, charges can be further from each other.
- 8Why do field lines always leave the surface at 90˚?If Electric field is not at right angles there would be a component of the Electric Field which is parallel to the surface. Therefore, the particles would experience a force equal to qE(vector) and hence undergo an acceleration equal to (vector F/m). However, the particles undergo an equilibrium and remain static ∴there cannot be a horizontal component of the Electric Field ∴ field lines are perpendicular to the surface
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- Year 12 Physics Flashcards on Physics- Electric and Magnetic Fields, created by Krish Khatiwada on 23/05/2017.
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- Krish Khatiwada
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