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12th
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1
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What substance would not be attracted by a magnet?
Copper
2
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Describe magnetic field lines.
Show the strength and direction of magnetic field, become widely spread as the force weakens.
3
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What will happen when a magnet is heated?
It will become weaker.
4
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Describe a magnetic domain.
A group of atoms with their magnetic axes lined up in the same direction.
5
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What is it called when something is temporarily magnetized?
Induction.
6
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The strength of a magnetic feild of a coil can be increased by what?
* Increasing the current
* Increasing the number of loops
* Wrapping it around an iron core
7
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What would cause the armature of a DC motor to turn faster?
* increasing the current
* Increasing the turns
* Increasing the strength of the magnetic feild
8
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If a split-ring communicator of a DC motor was replaced with a solid commutator ring, what would happen the the armature?
It would stop when the coil was parallel to the magnetic feild.
9
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A conductor would be attracted to a magnet when…
The conductor caintains moving electrons.
10
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What did Heinrich Lenz state?
The direction of an induced current produces a magnetic field that opposes the inducing field.
11
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What does not affect the size of a induced current in a coil?
Direction of the windings in the coil.
12
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When a permanent magnet is held ready in the Center of a coil, the galvanometer will indicate…
No current.
13
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What factor increase the output of a generator?
* increasing the rate of rotation
* Increasing the strength of the magnets
* Increasing the number of coils
14
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If the connections to a step-up transformer are reversed and the secondary coil is now the primary coil, what will happen?
The transformer will step down the potential difference.
15
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What does a step-down transformer change?
High potential difference to low potential difference.
16
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What is the advantage of AC power over DC power?
AC power allows the operation of transformers.
17
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What does the speed of any mechanical wave as it propagates through a medium depend on?
The type of medium that it travels through.
18
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What is the shortest time interval in which a wave motion completely repeats itself?
A period.
19
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Which way do the particles move in a transverse wave?
Particles move forward with the wave.
20
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How is energy propagated in longitudinal waves?
It is propagated by crests and troughs.
21
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How do waves bend as they travel through small opening or past corners?
Diffraction.
22
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What is produced during complete destructive interference?
A node
23
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What property affects intensity or loudness?
Amplitude.
24
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What does the speed of sound that goes through air depend on?
Tempurature.
25
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During destructive interference what is produced?
A quieter sound.
26
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What causes waves to echo?
Reflection.
27
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Sound waves are…
Longitudinal.
28
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What does pitch depend on?
Loudness.
29
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What does Mach number represent?
The ratio of an objects speed to the speed of sound in air at that location.
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