Practice question · Fill in the blanks
Complete the condition for electromagnetic induction.
A voltage is induced in a loop when the magnetic flux through it ______.
Word bank: is large · is changing · is steady · points downward
Hints
- Faraday's law is about a rate of change, not an amount.
- Ask what a magnet must do, not what it must be.
Show the answer
A voltage is induced in a loop when the magnetic flux through it is changing.
Why
Change is the requirement, and it is the only one. Magnitude and direction affect how much and which way, but a field that never varies induces nothing regardless of how strong it is or where it points.
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