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30 Cards in this Set
- Front
- Back
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Induced current
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Faraday concluded that even if there's no current in a conductor in a constant magnetic field, a changing magnetic field can produce a electric current
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A changing magnetic field...
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induces an emf
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Lenz's law
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used to determine the direction of the electric current induced in a loop due to a change in magnetic flux inside the loop.
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How to produce an induced current
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1) a closed conducting loop
2)an external magnetic flux through the loop that is changing in time |
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The direction of the field is the same as the direction of the.....
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force on a positive charge
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electric field is a property of...
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space, not matter
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The direction of the field is....
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away from positive charge and toward a negative charge
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Electric charges produce...
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electric fields
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What produce magnetic fields?
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-Electric current
-Changing electric fields |
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The law of conservation of charge
Three(* |
1) The total amount of charge in a closed system is constant
2)Charge cannot be created or destroyed 3)The net amount of electric charge produced in any process is zero |
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Most objects are electrically neutral because they have equal numbers of
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protons and electrons
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Many of the electrons in an electrical conductor are
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free to move like metals
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Very few electrons are free to move
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Electrical insulator
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The magnitude of the force ______ as the distance between the charge objects _________
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The magnitude of the force decreases as the distance between the charged objects increases.
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Induction
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Electrons moving from one side to the other
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Insulator
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molecules become polarized and the net result is the same
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What does a electroscope do?
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Detect charages
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The electroscope can be charged by either
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conduction and induction
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Point charges is a particle that has
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no size but has a electrical charge
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Point charges
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if the size of two charged objects is much less than the distance between them
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coulombs law
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The magnitude of the force between two points charges is proportional to the product of the magnitudes of the two charges and inversely proportional to the square of the distance between them
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Gravity
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-inverse square force
-newtons law of universal gravitation both similar to coulombs law |
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Gravity is attractive and much _____ than the electric forcec
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weaker
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Point charge
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F=k lQl lql / r^2
E= k lQl / r^2 |
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Electric force
(Force on a point charge in a electric field) |
F=qE
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The electric field can be represented by field lines. These lines start on
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positive and end on negative
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The electric field is stronger where the field lines are
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closer together
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Electric dipole
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two equal magnitude charges, opposite in sign
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The electric field at some point is tangent to the field line at that point
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electric dipole
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Electric field lines
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1) Field lines indicate the direction of the field, the field is tangent to the line.
2)The magnitude of the field is proportional to the density of the lines. 3) Field lines start on positive charges and end on negative charges;the number is proportional to the magnitude of the charge 4)Field lines cannot cross or have kinks |
