Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
13 Cards in this Set
- Front
- Back
|
What is Electric Field Strength? |
Force per unit positive charge |
|
|
What is Coulomb's Law? |
|
|
|
How do you calculate the magnitude of a uniform electric field between two plates? |
E=V/D |
|
|
Explain the effect of a uniform electric field on the motion of a charged particle. |
Charged particles move through like projectiles, along a curved path. A positive particle will move in the direction of the field lines. A negative particle will oppose the field lines. This force has a constant acceleration. |
|
|
Define magnetic flux density. |
The measure of the strength of a magnetic field per unit area. |
|
|
Explain the use of deflection of charged particles in a mass spectrometer. |
The ions move in an arc along a curved tube to the detector. Then the identity of the ion can be determined from their mass to charge ratio. |
|
|
Define magnetic flux. |
The total number of field lines, total magnetic flux = BAcosX |
|
|
Define the weber. |
A change in flux of one weber per second will induce an e.m.f. of 1 volt in a loop of wire. |
|
|
Define magnetic flux linkage. |
Magnetic flux multiplied by the number of turns. |
|
|
State Faraday's law. |
Induced e.m.f. = ∆flux/∆time |
|
|
State Lenz's law. |
The induced e.m.f. is always in such a direction as to oppose the change that caused it. Therefore induced e.m.f. = ∆flux linkage/time |
|
|
What is the function of an A.C. generator? |
Convert kinetic energy into electrical energy via induction of an electric current by rotating a coil in a magnetic field. |
|
|
Describe the function of a transformer. |
Devices that use electromagnetic induction to change the size of the voltage for an alternating current. |
