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Aim: How do we explain electric fields?
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Electric Field Concept
All charges produce electric fields (just as all masses produce gravitational fields). Any charge placed in an electric field will experience an electrostatic force.
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Electric Field Intensity
We can calculate the electric field intensity by placing a test charge in an electric field, measuring the electrostatic force acting on the test charge, and dividing the force by the magnitude of the test charge. E=F/q
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Electric Field Intensity
E= F/q E= electric field intensity F= electrostatic force q= test charge Electric Field strength is a vector quantity. It is measured in the units (Newtons/Coulomb)
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Electric Field problems
A 0.03 C test charge experiences a force of 20 N when placed at point A. What is the electric field intensity at point A? E=F/q=20N/0.03C= N/C 2.What is the magnitude of the electrostatic force experienced by 8 x 10-6 C test charge when it is placed at a point where the electric field intensity is 150 N/C? E=F/q 150 N/C=F/(8x10-6 C) F= N
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Visualizing Electric Fields
Electric Fields around positive and negative point charges.
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Rules for Drawing Electric Fields
Electric field lines must begin on positive charges and end on negative charges The number of lines beginning on a positive charge or ending on a negative charge are proportional to the magnitude of the charge. No two field lines can cross each other
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Rank the charges from greatest to weakest
C>B>A
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Electric Field around Two Opposite Charges
Electric Dipole
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Electric Field Around Two Like Charges
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Uniform Electric Field
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