Physics A-Level
The minus sign in the induction equation
What The minus sign in the induction equation means in Physics A-Level, as defined for OCR.
Definition of The minus sign in the induction equation
Check what you remember
Read the wording for your board, then hide it and explain The minus sign in the induction equation in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
In E = −N ΔΦ/Δt it expresses Lenz's law and indicates the opposing direction of the induced e.m.f.
Topics that use The minus sign in the induction equation
- Electromagnetism (OCR A-Level)
Related terms
- Faraday's law
- Lenz's law
- Magnetic flux
- Transformer action and turns ratio
- Weber
- Angle between field and normal
- Energy losses and laminated cores
- Factors that change flux linkage
Using The minus sign in the induction equation in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Physics questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Physics A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge