Two point charges are placed on the x axis as follows: Charge q1= +4.00 nC is located at x= 0.200 m, and charge q2= +5.00nC is at x= -0.300 m. What are the magnitude and direction of the net force exerted by these two charges on a negative point charge q3= -0.600 nC placed at the origin?

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  1. Use Coulomb's law and add the two forces on q3 as vectors. Charges q1 and q2 pull q3 in opposite directions, because they are on opposite sides of q3. .

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  2. A heat-conducting rod consists of an aluminum section, 0.20 m long, and a copper section, long. Both sections have a cross-sectional area of The aluminum end of the rod is maintained at a temperature of , while the copper end is maintained at What is the temperature at the point where the aluminum and copper sections meet? The thermal conductivity of aluminum is 205 W/m ∙ K, and of copper is 385 W/m ∙ K.

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