OCR A A-Level Physics Paper 2

What is the value of the prefix T (tera) 10¹² What is the value of the prefix G (giga) 10⁹ What is the value of the prefix M (mega) 10⁶ What is the value of the prefix k (kilo) 10³ What is the value of the prefix d (deci) 10⁻¹ What is the value of the prefix c (centi) 10⁻² What is the value of the prefix m (milli) 10⁻³ What is the value of the prefix μ (micro) 10⁻⁶ What is the value of the prefix n (nano) 10⁻⁹

Electric Field A region around a body in which another charged body feels a force Electric Field Strength (NC^-1) The force per unit positive charge Magnetic Flux (Wb) The product of the MFD and the Area Magnetic Flux Density (T) The force per unit length on a conductor carrying a unit current at that point Tesla Measure of MF per area squared Weber Measure of MF when the magnetic field of MFD is 1m^2 Magnetic Flux Linkage (weber-turns) The product of the Magnetic Flux and the numbe...

What is displacement? The distance travelled in a particular direction. It's a vector quantity with magnitude and direction. Measured in meters. What is instantaneous speed? The speed at the moment it's measured - speed over an infinitesimal interval of time. What is average speed? The rate of change in distance calculated over a complete journey. What is average velocity? The change in displacement Δs for a journey divided by the time taken Δt. So Δs/Δt What is acceleration? ...

What is a charge carrier? A charged particle capable of transferring electric current. What do we mean when we say charge is quantised? It can only take certain values (always ne) If n electrons are removed from a neutral object what is its charge? ne What is an electrolyte? A liquid containing charged ions. What is a metallic conductor? A material comprising a lattice of positive ions and delocalised electrons that carry electrical current Which direction does conventional current flo...

Speed =distance / time Velocity Is a vector and therefore has both direction and magnitude. =displacement / time Accelaration =(v-u)/t Where v is initial velocity and u is final velocity Displacement time graph upward slope - constant positive velocity flat line - stationary downward slope - negative constant velocity It can often be easier to just draw a distance-time graph. velocity-time graph Acceleration-time graph a graph describing motion of an object, with acceleration on t...

Displacement The distance travelled in a particular direction - it is a vector with magnitude and direction. Instantaneous Speed The rate of change of distance at a specific moment in time - change in distance divided by an infinitesimal interval of time. Average Speed The rate of change of distance calculated over a complete journey Velocity A vector quantity equal to the rate of change of displacement. Average Velocity The change in displacement (Δs) for a journey divided by the time...

Speed =distance / time Velocity Is a vector and therefore has both direction and magnitude. =displacement / time Accelaration =(v-u)/t Where v is initial velocity and u is final velocity Displacement time graph upward slope - constant positive velocity flat line - stationary downward slope - negative constant velocity It can often be easier to just draw a distance-time graph. velocity-time graph Acceleration-time graph a graph describing motion of an object, with acceleration on t...

Study Difference between stationary and progressive waves A progressive wave transfers energy, all parts of its wave have the same amplitude Mean drift velocity The average displacement of electrons as they move along a wire per second On average, they travel more slowly in one direction through the metal lattice due to collisions with it Number density of conductors, insulators and semiconductors Conductors - 10^29 Semiconductors - 10^19 Insulators - 10^9 Potential difference Energ...

What is elementary charge equal to? 1.6 x10^-19 C What direction does convectional current travel? From + to - What direction is electron flow? From - to + State Kirchhoff's first law At any point in an electrical circuit, the sum of currents entering a point is equal to the sum of currents leaving the point What is mean drift velocity? The average velocity of electrons as they move through a wire Difference between conductors, semiconductors and insulators Conductors - High number...

Study Speed =distance / time Velocity Is a vector and therefore has both direction and magnitude. =displacement / time Accelaration =(v-u)/t Where v is initial velocity and u is final velocity Displacement time graph upward slope - constant positive velocity flat line - stationary downward slope - negative constant velocity It can often be easier to just draw a distance-time graph. velocity-time graph Acceleration-time graph a graph describing motion of an object, with accelerati...