phys w8
What is AC current?
Alternating Current, a current that can change directions
in what direction does an induced current create a magnetic field
in the direction that opposes change in magnetic flux
if the magnetic flux goes to the left, what direction will B point and why
it will move to the right in order to boost the decreasing magnetic field
if the magnetic flux goes to the right, what direction will the magnetic field be and why
it will oppose it, point left to oppose the magnetic flux of the magnet
what is theta in between for magnetic flux
magnetic field and direction of Fn of surface
why do magnetic objects experience torque?
so the object can align with the magnetic field
Explain Faraday's Law of Induction
the magnetic flux through a wire produces an electrical potential difference (voltage)
what is magnetic flux
the number of magnetic field lines passing through a surface, perpendicular to the area and the cross-sectional area
does a bar magnet placed in a uniform magnetic field experience torque? Net force?
yes - N and S poles experiences forces opposite of each other -0 net force
when a magnet is placed in a non-uniform magnetic field is there torque? is there a net force?
yes -there will be a net force
in a current loop in a uniform magnetic field, what angles result in a force, what angles dont?
0 & 180= no force 90 & 270= force bc they will be perpendicular to the magnetic field
what produces a greater induced current?
1.move the magnet faster 2. stronger magnetic field 3. area of wire loop
What is DC current?
Direct Current, a current that can only travel in one direction
what is Lenz law
Lenz' law says the magnetic field induced in a coil will always oppose the field that caused it.
what is electromagnetic induction
The creation of a voltage in a wire which is experiencing a change in magnetic field due to a force
