mutual induction
C1Formal, Academic, Technical
Definition
Meaning
The phenomenon where a changing current in one circuit (or coil) induces an electromotive force (voltage) in a nearby circuit without any physical connection.
The fundamental principle behind electrical transformers and many wireless technologies, describing how energy can be transferred between circuits through a shared magnetic field. It's a specific case of electromagnetic induction.
Linguistics
Semantic Notes
The term is highly specific to physics and electrical engineering. The 'mutual' refers to the shared magnetic field between two separate circuits, unlike 'self-induction' which occurs within a single circuit.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences; the concept and term are identical. Spelling follows regional norms for other words in the sentence (e.g., 'behaviour' vs. 'behavior').
Connotations
None beyond the technical meaning.
Frequency
Equally low-frequency and specialised in both dialects, confined to technical contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
Mutual induction [occurs|happens|takes place] between X and Y.X [exhibits|demonstrates|utilises] mutual induction with Y.The [coefficient|effect] of mutual induction [depends on|is determined by] Z.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Rarely used directly. Might appear in technical specifications for electrical components or in R&D discussions about wireless charging.
Academic
Core concept in university-level physics and electrical engineering courses, especially in electromagnetism and circuit theory.
Everyday
Virtually never used. A layperson might encounter it in a documentary about electricity or wireless technology.
Technical
Standard, precise term in electrical engineering, physics, and electronics design (e.g., transformer design, inductive sensors, wireless power transfer).
Examples
By Part of Speech
noun
British English
- The mutual induction between the primary and secondary coils is crucial for the transformer's efficiency.
- Faraday's experiments brilliantly demonstrated the principle of mutual induction.
American English
- The design minimizes unwanted mutual induction between adjacent circuit traces.
- Mutual induction is the key operating principle behind wireless chargers for phones.
Examples
By CEFR Level
- Two coils of wire placed close together can create mutual induction.
- A transformer works because of mutual induction.
- The lecturer demonstrated mutual induction by powering a light bulb with a coil that wasn't physically connected to the source.
- The efficiency of the energy transfer depends on the strength of the mutual induction between the circuits.
- The coefficient of mutual induction, typically denoted by M, quantifies the inductive coupling between two circuits and is measured in henries.
- Stray mutual induction from nearby power lines can introduce interference into sensitive audio equipment, necessitating careful shielding.
Learning
Memory Aids
Mnemonic
Think of two people (coils) who don't touch but can communicate by passing notes via a shared friend (the magnetic field). The change in one person's message induces a message in the other.
Conceptual Metaphor
INVISIBLE CONNECTION / ENERGY BRIDGE / MAGNETIC CONVERSATION
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- False friend: 'Mutual' does not mean 'мгновенный' (instantaneous). It means 'взаимный'.
- Do not confuse with 'self-induction' ('самоиндукция').
Common Mistakes
- Using 'mutual induction' to describe any magnetic effect (it's specifically between two circuits).
- Confusing it with 'electromagnetic induction' (the broader category) or 'self-induction' (within one coil).
- Incorrect phrasing: 'mutual induction of current' (it is the induction of a voltage/EMF, which may then cause a current).
Practice
Quiz
What is the primary physical quantity induced in a circuit by mutual induction?
FAQ
Frequently Asked Questions
Wireless charging is a practical application that uses mutual induction. The term 'mutual induction' describes the underlying physical principle.
Mutual induction involves two separate circuits influencing each other via a shared magnetic field. Self-induction occurs within a single circuit, where a changing current induces a voltage in that same circuit.
A transformer is a device built specifically to utilise mutual induction. An alternating current in the primary coil creates a changing magnetic field, which induces a voltage in the separate secondary coil via mutual induction.
Only when the DC current is switched on, off, or changed. A steady DC current produces a constant magnetic field, and a constant field does not induce a voltage. Mutual induction requires a changing current/magnetic field.