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Notes on physics ii (phy 2054) covering coulomb's law and electric fields. It includes explanations on the direction of forces, calculating force magnitudes, and the introduction of charges. There are also practice problems for ranking charges and magnitudes of electric fields.
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If someone shows you a trick, it means that,^ ^ It is possible to do that trick^ ^ The person who showed you, can do the trick^ ^ It does not mean that you can do the trick. Try it a lot of times and you can too.
^ Recall^ ^ Coulomb’s law ^ The direction is away, unless the chargesare different. ^ Forces are vectors, they add as vectors ^ F in Newtons, R in meters and q in Coulomb
qq^21 ˆ^ rkF =^2 r
ignoring
the signs of charges.
Then assign the direction by looking at the signs. Never do both
(using the charge signs in the calculation of the force and
then^ assign the direction).
Rank
them by^ ^ Charge left^ ^ Magnitude of Force before^ ^ After^ ^ Charge transferred
total charge
around it. The magnitude of the electricfield at the center of the ring is(a) 0^ (b)
2
(e) none of these
C in the figure, with the largestmagnitude first. (a)A, C, B (b)
A,B,C (c)C,
A,B
(d) Can’t be determined by visual inspection
