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AP Physics C Magneostatics
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Gravity
Key Concepts:
Terms in this set (23)
Magnetic fields are formed by...
moving charge.
Magnetic forces cannot change the __ or __ of charged particles
speed , kinetic energy
Because magnets cannot change the kinetic energy of a charged particle, it follows that a magnet can __ on a particle.
do work
Magnetic forces can __ particles by changing their direction and also change the __ of the particles.
accelerate , path
Formula: Magnetic Force on a charged particle
F = qvBsin(º)
The magnetic force on a charged particle is...
centripetal.
Formula: Magnetic Force on a current-carrying wire
F = ILB
The formula for magnetic force on a current carrying wire can be derived from the force on a charged particle knowing...
I = dq/dt. F = qvB = ItvB = ILB.
Keeping an object suspended usually involves setting an equation for force equal to an equation for...
force of gravity.
Formula: Torque on Wire Loop
T = NIAB
In a singular loop/square, T =...
IAB
Concept: Right Hand Rule for Charged Particles
Flat palm like a high five: Thumb points to velocity, palm of hand points to force, fingers point to magnetic field.
When does a charged particle take a circular path in a magnetic field?
When velocity if perpendicular to the field
When does a charged particle take a helical path in a magnetic field?
When velocity has a component parallel to the field
When does a charged particle take a straight path in a magnetic field?
When velocity is entirely parallel to the field.
No work is ever done in a magnetic field because...
Velocity and force are always perpendicular
Currents, defined as change in charge over time, can cause...
magnetic fields.
Formula: Magnetic Field caused by Current
B = U(o)I / 2πr
Process: Finding the force two parallel wires exert on each other
1. Find B of one wire
2. Plug in the B into the formula for force on a current-carrying wire
3. Solve
Formula: Ampere's Law
U(o)I = Integral B
ds = B
circumference
Magnetic flux is the product of...
magnetic field and area
Maximum flux is achieved when...
the area vector (perpendicular to area) is parallel to field.
Minimum flux is achieved when...
the area vector (perpendicular to the area) is perpendicular to the field.
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