Physics · Grades 10–12
Magnetism & induction · Formula reference
Formula reference
Rule and assumptions
Ideal transformer voltage ratio
This ideal transformer model uses alternating voltage; it is not a mains-wiring activity.
Vs/Vp = Ns/Np
Force on a perpendicular current-carrying wire
The straight active wire length is perpendicular to the uniform magnetic field.
F = BIL
Average induced emf
Use flux change per turn; the question asks magnitude, not the direction set by Lenz’s law.
|ε̄| = N|ΔΦ|/Δt
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Learning preview · independent educational and translation review required. Suggested grades are not official curriculum alignment.