Electromagnetism II Flashcards
Because this fucking retarded trash does not allow me to edit something that had been edited in advanced editor.
I paid $50 for this shit that doesn’t have advanced editor on mobile. Fuck this crap.
How does a velocity selector work?
Particles with a specific speed continue to travel in a straight path while particles with other speeds are deflected. The velocity selector is arranged such that electric field produces a force in the opposite direction on a charged particle compared to the magnetic field. (Perpendicular to each other)
Derive the speed at which a charged particle is not deflected in a velocity selector.
This occurs when there is no net force, aka electric force = magnetic force. qE = Bqv. v = E/B.
Explain the direction charged particles are deflected in a velocity selector based on their speed.
The electric force is always the same since qE is constant. If the speed is slower than v = E/B, magnetic force, Bqv is lower so there is net force by the electric field so the particle will be deflected in the direction of the electric field. Vice versa.
Why is the deflection of particles in a velocity selector independent of charge?
Charge affects both electric force and magnetic force proportionally.
What is the magnetic flux density in a Long straight wire?
B mu0 I/(2pi d) where d is the distance from the wire and mu0 is the permeability of free space
What is the flux Density at the centre of a flat coil with n turns and radius r?
B = mu0 NI/(2r)
What is the flux density at the centre of a Long solenoid?
B = mu0 n I
n is the number of turns per metre.
With a ferrous core the flux density is multiplied by _____.
The factor of the permeability of the ferrous core to mu0. (At the same temperature)
How is the direction of the force on a current-carrying straight wire by another parallel current-carrying straight wire determined?
Magnetic field lines of wire is circular and perpendicular to any parallel wires. Thus, the force is perpendicular to both the direction of current and the magnetic field.
Derive the force exerted on a current-carrying wire by another current-carrying wire that is parallel.
F = BIL B = mu0 I/(2pi d) F = mu0 I1I2 l/ (2pi d)
The other wire exerts the same but opposite force because of N3L.
Why are magnetic field lines in the same direction stronger?
S
Why are magnetic field lines in opposite directions weak?
They magnetic field of each line cancel each other out.
As the charged particle moves towards the velocity, what energy is lost what energy is gained?
As the particle is increasing in speed, it gains kinetic energy the energy comes from its electric potential. 0.5mv2 = QV
