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electric field
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- 1define coulombs lawcoulombs law "the force F acting between two charged bodies is indirectly proportional to the square of the distance between them and directly proportional to the product of the two charged bodies"
- 2what does the symbol represent and what are the units (learnt in college)the constant for the permittivity of free space
F/M farad/metres - 3define electric fieldelectric field is a space where a force is exerted on a charge
- 4define electric field strengthelectric field strength is the force per unit positive charge
- 5what are three equations involving electric field strengthE=V/D
E=F/Q
- 6Is electric field a vector or scalar?vector
- 7is electric potential a vector or scalar?scalar
- 8what term is given to the electric field lines between two parallel platesuniform - the force on a positive charge is the same at all points in the electric field
- 9what do electric field lines show?a field line shows the direction of the force acting on a positive charge
- 10describe what the field lines of two close positive charges look like
- 11describe what the field lines of two close oppostie charges look like
- 12explain how the process of the shuttle ball demonstration workselectrons are shifted to one side of the pith ball, as they are attracted to the positive plate and repelled by the negative plate. when the sphere hits the positive plate it loses electrons, so it now has a net positive charge, so it is repelled from the positive plate and attracted to the negative plate where it gains negative electrons until it repels and repeats. overall this is a flow of current and is measured with a sensitive ammeter
- 13define electric potentialthe electric potential at a point is the work done in taking a positive charge from infinity to that point
- 14why is electric potential positive around a positive charge?work is required to move +1C from infinity to a point around a charge as there is a repulsive force which work needs to be done against to move +1C to +Q charge
- 15why is electric potential negative around a negative charge?the potential around a negative charge is negative because negative charges attract positive charges, therefore no work is done pulling +1C from infinity to a negative charge
- 163 features of equipotentialsthe closer they are the stronger the electric field strength
right angles to field lines
no work done moving along them - 17define electric potential energythe electric potential energy of a charge at a point is the work done in taking a charge from infinity to that point
- 18formula for electrical potential energy
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- Fichas sobre electric field, creado por Nat Waterworth el 20/10/2015.
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- Nat Waterworth
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