Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/31

Click to flip

31 Cards in this Set

  • Front
  • Back

Magnets




Like poles _____


Unlike poles _____


Are magnetic monopoles found in nature?

Like poles repel


Unlike poles attract


No

Magnetic fields are always ____ ____


They emerge from the ____ pole and enter the ___ pole

-Magnetic fields are always closed loops.
-They emerge from the north pole and enter the south pole.

-Magnetic fields are always closed loops.


-They emerge from the north pole and enter the south pole.

Describe the right hand rules

Describe the right hand rules

A ____ charge has an E field and no B field associated with it.


A ____ charge has an E field and B field associated with it.

A static charge has an E field and no B field associated with it.


A moving charge has an E field and B field associated with it.

-Two parallel currents exert a ___ on each other.


-Parallel currents ___


-Antiparallel currents ___


-Notice that the force on one wire is due only to the field produced by the other wire. Wires don't produce a force on themselves.

-Two parallel currents exert a force on each other.


-Parallel currents attract


-Antiparallel currents repel

How do you calculate the force between two parallel current-carrying wires?

F= uo I1 I2 L2 / 2pi d



-Maximum torque occurs when the coil's face is ____ to the magnetic field. And when the magnetic moment/rotational axis is ___ to the B field

parallel 

parallel, perpendicular

1. F= ILBsin(theta)-> theta is between?


2. F= qvBsin(theta) -> theta is between?


3. torque= NIABsin(theta) -> theta is between?

1. Current (I) and magnetic field (B)


2. Velocity (v) and magnetic field (B)


3. Magnetic moment (M) and Magnetic field (B)

-Region A: induced current will be ___
-Region B: induced current will be ___

-Region A: induced current will be ___


-Region B: induced current will be ___

-CCW (region is gaining flux into the page)


-CW (region is losing flux into the page)

____ forces associated with eddy currents can dramatically slow a conductor moving into or out of a magnetic field

Drag

Induced emf _______ the original flux change

Induced emf opposes the original flux change

Changing ___ ___ induces an electric field


(and vice-versa)


(extra term in maxwell equations)

Changing magnetic field induces an electric field


(extra term in maxwell equations)

Electric generator converts ___ energy to ___ energy.

Electric generator converts mechanical energy to electrical energy.

Changing magnetic flux in the coils induce an ___, which drives an alternating current through an external circuit.

Changing magnetic flux in the coils induce an emf, which drives an alternating current through an external circuit.

-Initially:
-With time:
-Eventually:

-Initially:


-With time:


-Eventually:

-Initially:  A large emf develops across L to oppose the increasing current. (most emf across L)
-With time: I increases less rapidly
-Eventually: All the voltage drop is across R

-Initially: A large emf develops across L to oppose the increasing current. (most emf across L)


-With time: I increases less rapidly


-Eventually: All the voltage drop is across R

Right hand rule for EM waves



The magnetic and electric fields are ____ to each other

The magnetic and electric fields are perpendicular to each other

Looking into a plane flat mirror, the image behind it is ___ and the ____ ____

Looking into a plane flat mirror, the image behind it is virtual and the same size (as the object)

Concave Mirror




Outside C

smaller, inverted, real

smaller, inverted, real

Concave Mirror




Between C and F

larger, inverted, real

larger, inverted, real

Concave Mirror




Inside F

Larger, upright, virtual

Larger, upright, virtual

Convex Mirror



Smaller, upright, virtual

Smaller, upright, virtual



Sign Conventions for Spherical Mirror

Converging Lens




Beyond F'

inverted, real

inverted, real

Converging Lens




Inside F'

Upright, virtual, larger

Upright, virtual, larger

Diverging lens



Upright, virtual, smaller

Upright, virtual, smaller

Sign conventions for lenses

-Converging lens focuses incoming parallel rays to a ___


-Diverging lens spreads incoming rays so that they appear to come from a point ___ the lens

-Converging lens focuses incoming parallel rays to a point.


-Diverging lens spreads incoming rays so that they appear to come from a point before the lens.

Magnetic field in a solenoid

A negative charge (-Q) is placed at rest near a magnet. Will the charge begin to move? Will it feel a force?

No


A charge at rest has velocity equal to zero; magnetic fields exert a force only on moving electric charges.

an inductor always resists change in magnetic flux. The induced emf will oppose change. 

an inductor always resists change in magnetic flux. The induced emf will oppose change.