You are investigating electromagnetic induction in a lab. A coil is inside a changing magnetic field, and you need to find the induced EMF and predict the direction of induced current.
Formula Sheet
EMF = −N·ΔΦ/ΔtΦ = B·A·cosθVs/Vp = Ns/NpLenz: oppose changeWhat is the change in magnetic flux ΔΦ through the coil? (A = 50 cm² = 50×10⁻⁴ m²)
What is the magnitude of the induced EMF? (N = 200 turns, Δt = 0.4 s)
If the magnetic field is increasing into the page, the induced current (viewed from above) flows:
A transformer has 100 primary turns and 500 secondary turns. If the primary voltage is 120V, what is the secondary voltage?