phys w8

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

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


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