All Flashcards
What are three ways to change magnetic flux?
- Changing the magnetic field strength (B). 2. Changing the area (A) of the loop in the field. 3. Changing the angle (θ) between the field and area.
Describe how a motional EMF flashlight works.
A metal bar moves, sweeping area A = lΔx. The increasing area increases magnetic flux (ΦB = ∫ B ⋅ dA = BA). The induced field opposes this. Using RHR #2, the current flows CCW.
Label the primary and secondary sides of a transformer.
Primary Side: Input voltage | Secondary Side: Output voltage
What is the effect of increasing the number of loops in the secondary coil of a transformer?
The output voltage increases (voltage step-up).
What is the effect of moving a magnet towards a conducting loop?
A current is induced in the loop, creating a magnetic field that opposes the motion of the magnet.
What happens when a conducting rod moves through a magnetic field?
A motional EMF is induced in the rod, given by .
What is the effect of increasing the velocity of a conducting rod moving through a magnetic field?
The induced EMF increases, leading to a larger induced current if the circuit is closed.
What is the effect of increasing the magnetic field strength on a moving conductor?
The induced EMF increases, leading to a larger induced current and force.