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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 |
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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. |
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Describe the right hand rules |
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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. |
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-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 |
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How do you calculate the force between two parallel current-carrying wires?
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F= uo I1 I2 L2 / 2pi d |
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-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, perpendicular |
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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) |
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-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) |
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____ forces associated with eddy currents can dramatically slow a conductor moving into or out of a magnetic field |
Drag |
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Induced emf _______ the original flux change |
Induced emf opposes the original flux change |
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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) |
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Electric generator converts ___ energy to ___ energy. |
Electric generator converts mechanical energy to electrical energy. |
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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. |
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-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 |
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Right hand rule for EM waves |
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The magnetic and electric fields are ____ to each other |
The magnetic and electric fields are perpendicular to each other |
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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) |
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Concave Mirror Outside C |
smaller, inverted, real |
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Concave Mirror Between C and F |
larger, inverted, real |
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Concave Mirror Inside F |
Larger, upright, virtual |
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Convex Mirror |
Smaller, upright, virtual |
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Sign Conventions for Spherical Mirror |
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Converging Lens Beyond F' |
inverted, real |
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Converging Lens Inside F' |
Upright, virtual, larger |
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Diverging lens |
Upright, virtual, smaller |
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Sign conventions for lenses |
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-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. |
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Magnetic field in a solenoid |
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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. |
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an inductor always resists change in magnetic flux. The induced emf will oppose change. |