Electricity and magnetism
AHL Electric fields
In an electrical circuit, electrons move due to potential difference. Electric fields caused by charged plates, point charges or charged spheres cause lone charges to accelerate. This changes their energy. Key Concepts Uniform fields Field lines A un…
Electricity and magnetism
Electric fields
…the nucleus, are uncharged. A particle that has electrons added or removed is called an ion, a charged particle. Electric fields and forces An electric field is a region of space where a charge experiences a force. Electric fields cause a non-cont…
Electricity and magnetism
Magnetic fields
…ally a South? Why do we define magnetic field in terms of rotation not acceleration? What is the connection between magnetic fields and electric current? And why don't magnetic waves exist without electric waves? Key Concepts Magnets Iron is th…
Circular motion and gravity
AHL Gravitational fields
…act radial. This has implications for how we calculate forces, field strength, potential and energies. Key Concepts Uniform fields Field strength Close to the surface of a large spherical mass, the surface appears horizontal and the gravitational fi…
Circular motion and gravity
Uniform fields
The Earth's field isn't really uniform but it's close enough when we are near the surface. We often make simplifications like this, which is ok providing we don't forget the limitations. Summary Field strength and field lines Watch …
Electricity and magnetism
Magnets
Magnetic fields are defined in terms of the rotation of a small magnetic dipole. This makes them quite different to electric and gravitational fields. Fortunately there is a lot you can memorise here, and the calculations required are less challengi…
Circular motion and gravity
…ble to: Perform calculations for objects moving in a circle State Newton's law of gravitation Compare uniform and radial fields Explain how the radius of a satellite's orbit affects its speed And, at Higher Level: Describe how satellites stay…
Circular motion and gravity
Gravitation
A field is a region of space where a force is experienced: Gravitational fields - objects with mass Electrostatic fields - objects with charge Magnetic fields - moving charges or permanent magnets Key Concepts Gravity is the phenomenon by which objec…
Revision tips
Mind maps and revision techniques
…ding Waves) Oscillations & waves - Bitesize Gallery: Waves - bitesize Mode: simple Thumb width: 128px Layout: row Electric fields & electricity - Bitesize (but not Magnetism) Gallery: Electricity - bitesize Mode: simple Thumb width: 128px Layout: r…
Electricity and magnetism
Electromagnets
…s concentric circles. The direction of the field is found using the right hand grip rule. Loops of wire See how to add the fields of each loop of coil when forming a solenoid. Test Yourself Use quizzes to practise application of theory. Moving c…
Electricity and magnetism
Force on a current-carrying conductor
…of a continuous electric motor. The force on each side is in the opposite direction so the coil rotates. Non-perpendicular fields An exam question will not necessarily always have the magnetic field perfectly at right angles to the current. In thes…
Electricity and magnetism
Moving charges in a magnetic field
…the resulting motion is circular. Test Yourself Use quizzes to practise application of theory. Moving charges in magnetic fields 12/12/2016 [SLIDES]: charges moving in B fields Just for Fun The sections that follow are for interest, rather than…
Energy production
Power stations
…k. Electromagnetic induction - the generator As discussed in the Magnetic fields section, there is a link between magnetic fields, current and movement. When a conductor (such as a wire) moves in a magnetic (B) field, the electrons in it experience…
Circular motion and gravity
Newton's law of gravitation
…universe and, while on your data booklet, is certainly worth remembering. The field concepts here are also used in Electric fields. Key Concepts Force between point masses Gravitational forces form Newton's third law pairs, with the forces in o…
Oscillations and waves
Light
…etic spectrum Light is part of the electromagnetic spectrum. Electromagnetic waves are disturbances in electric and magnetic fields. They are not mechanical waves so require no medium. Reflection When light strikes the boundary between two media, p…
Electricity and magnetism
Electric field lines
…there is any field. Summary An electric field is a region of space where a charge will experience a force. We can't see fields, but we can draw field lines to give a visual representation. These show the direction a positive charge would acceler…
Electricity and magnetism
Coulombs law and field strength
…d between points and spheres of charge. Exam-style Questions Online tutorials to help you solve original problems Electric Fields 1: Where is the electric field zero between two spheres of charge? …
Electricity and magnetism
What to expect In this section you will learn about the big ideas of charge, a property that interacts with electric fields, electricity, the movement of charges in response to a force within a conductor, and magnetism, the forces exerted on magnetic…
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Coming soon
…n an hour's tuition!). Latest updates: Past paper walk-throughs are up and running AHL Waves and EM Induction topics AHL Fields and Quantum topics Two Options in full Things to look out for... Required practical revision guide Even more questions…
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