1
Q
What is a field?
A
A region where a body experiences a non-contact force. Represented as a vector
2
Q
What 3 interactions cause force fields to arise?
A
- Mass (gravitational)
- Static charge (electric)
- Moving charge (magnetic)
3
Q
4 Similarities of Gravitational and Electrostatic Forces
A
- Inverse-square law (F∝1/r^2)
- Both use field lines to show direction/magnitude
- Use of potential concept
- Equipotential surface
4
Q
1 Difference of Gravitational and Electrostatic Forces
A
- Gravitational is always attractive, Electrostatic can attract or repel
5
Q
What is the potential concept?
A
Work done for every kilogram of mass to said mass from infinity to a point in a field.
6
Q
When a force is attractive, what sign would it have?
A
Negative
7
Q
What is Vg at infinity?
A
0
8
Q
What happens as r decreases?
A
Vg decreases
9
Q
What are equipotential surfaces?
A
Area in field where it can be said g is the same. No work needed to move object between two points of surface. Not realistic
10
Q
What do tighter lines in a field show?
A
Stronger field strength
A-Level Physics 101
flashcards
Decks in class (38)
# Cards
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(1.1) - Use of SI Units & Their Prefixes22
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(1.2) - Limitation of physical measurements21
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(1.3) - Estimation of physical quantities0
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(2.1) - Particles and Radiation45
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(2.2) - Electromagnetic Radiation and Quantum Phenomena17
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(3.0) - Wave Definitions29
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(3.1) - Progressive and Stationary Waves28
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(3.2) - Refraction, Diffraction and Interference30
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(4.1.0) - Mechanics Definitions18
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(4.1) - Mechanics21
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(4.2.0) - Materials Definitions14
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(4.2) - Materials7
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(4.2) - Materials4
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(5.0) - Electricity Definitions18
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(5.1) - Current Electricity35
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(6.1.0) - Further Mechanics Definitions12
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(6.1) - Further Mechanics17
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(6.2) - Thermal Physics0
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(7.1) - Fields10
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(7.2) - Gravitational fields3
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(7.3) - Electric Fields8
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(7.4) - Capacitance12
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(7.5) - Magnetic Fields20
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(8.1) - Radioactivity2
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(9.1) - Telescopes15
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(9.2) - Classification of stars3
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Required Practical 1 - Investigation into the variation of the frequency of stationary waves on a string with length, tension & mass per unit length of the string0
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Required Practical 2 - Investigation of interference effects to include the Young’s slit experiment & interference by a diffraction grating.0
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Required Practical 3 - Determination of g by a free-fall method0
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Required Practical 4 - Determination of the Young modulus by a simple method.0
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Required Practical 5 - Determination of resistivity of a wire using a micrometer, ammeter & voltmeter.0
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Required Practical 6 - Investigation of the emf & internal resistance of electric cells & batteries by measuring the variation of the terminal pd of the cell with current in it0
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Required Practical 7 - Investigation into simple harmonic motion using a mass–spring system & a simple pendulum.0
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Required Practical 8 - Investigation of Boyle’s (constant temperature) law & Charles’s (constant pressure) law for a gas.0
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Required Practical 9 - Investigation of the charge & discharge of capacitors. Analysis techniques should include log-linear plotting leading to a determination of the time constant RC.0
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Required Practical 10 - Investigate how the force on a wire varies with flux density, current & length of wire using a top pan balance.0
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Required Practical 11 - Investigate, using a search coil and oscilloscope, the effect on magnetic flux linkage of varying the angle between a search coil & magnetic field direction.0
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Required Practical 12 - Investigation of the inverse-square law for gamma radiation.0
