MYP Physics: Static Electricity FAQ

Static electricity is the build-up of electric charge on the surface of an object, caused when electrons transfer between materials — usually through friction. In MYP Physics you study it under the Sciences framework as an example of electrical and magnetic phenomena, focusing on charge, conductors, insulators, and simple experiments like the rubbed balloon or acetate rod.

Static electricity happens when two materials rub together and electrons — never protons, which stay fixed in the nucleus — jump from one surface to the other. One object ends up with extra electrons and a negative charge, the other loses electrons and becomes positive. This charge imbalance stays "static" until it finds a path to earth or another object.

Static electricity is charge sitting still on a surface with no continuous flow, while current electricity is charge moving steadily through a closed conductor, like a circuit. Static charge builds up until it discharges suddenly — a spark or shock — whereas current electricity flows continuously as long as the circuit stays closed and powered.

Different materials hold onto their electrons with different strength, so when two materials touch and separate, electrons move from the material that grips them more loosely to the one that grips them more tightly. This is why rubbing a balloon on wool or hair transfers electrons and leaves the balloon negatively charged.

A Van de Graaff generator uses a moving rubber belt to carry charge from a low point up to a metal dome, building a large static charge on the dome's surface. Because charge collects on the outside of a conductor, the dome can reach very high voltages — enough to make hair stand on end or produce visible sparks.

Rubbing the balloon on hair transfers electrons onto it, giving the balloon a negative charge. Held near a wall, it repels electrons within the wall's surface slightly, leaving the nearer surface positively charged — that's electrostatic induction — and the opposite charges then attract, so the balloon sticks.

Electrostatic induction is when a charged object causes charge to rearrange in a nearby neutral object without any direct contact or electron transfer between them. The charged object repels like charges and attracts unlike charges within the neutral material, creating an induced charge separation — the basis for a charged rod attracting small bits of paper.

Conductors, like metals, let electrons move freely through them, so charge spreads out or drains away almost instantly — that's why static build-up rarely lasts on a metal rod you're holding. Insulators, like plastic, rubber and glass, don't let electrons move easily, so charge stays exactly where it was created on the surface.

Static electricity typically falls under Criterion A (Knowing and Understanding) and Criterion C (Processing and Evaluating) — explaining charge transfer and analysing spark or discharge data. According to the IB's MYP: Sciences guide, schools must assess all four criteria at least twice a year, so the topic could also feed into a Criterion B investigation.

Expect command terms like state (name the charge type), explain (why a balloon sticks to a wall), describe (how a Van de Graaff generator works) and compare (static versus current electricity). Command terms set the depth examiners expect — explain needs reasoning with "because", while describe wants a detailed account without justification.

Top marks come from linking the electron-transfer model to real observations — don't just say "it's charged," explain which material gained or lost electrons and why. Practise explain-style questions, use precise terms like induction, conductor and discharge, and always refer to electron movement, never "positive charge flowing," which is a real examiner pet peeve.

The biggest mistake is saying protons move during charging — they don't; only electrons transfer between materials. Others include confusing "charged" with "conducting," forgetting that induction needs no contact, and writing vague phrases like "more electricity" instead of naming the actual charge. Quick tip: always state which particle moves and in which direction.

MYP static electricity builds the electron-transfer model you'll need for DP Physics topics like electric fields, capacitance and Coulomb's law. According to the IB, DP Physics (first exams 2025) introduces quantitative treatment — calculating force between charges using Coulomb's law — building directly on the qualitative MYP foundation of charge, conductors and induction.

Not conceptually — most MYP 4-5 students find static electricity more intuitive than circuits, since it's visually demonstrable with balloons, hair and sparks, and needs little maths. Where students actually lose marks is in precise scientific vocabulary, not the ideas themselves, so the topic rewards careful writing more than raw problem-solving speed.

Look for resources with clear diagrams of electron transfer and induction, past-paper style explain questions, and criterion-matched marking guidance. Revision notes and topical worksheets that cover static electricity with worked explanations and criterion-aligned practice questions are the most useful format for building the precise vocabulary MYP examiners look for.