Two charges Q1(+2.00μC)Q1(+2.00μC) and Q2(+2.00μC)Q2(+2.00μC) are placed symmetrically along the x-axis at x=±3.00cmx=±3.00cm. Consider a charge Q3Q3 of charge +4.00μC+4.00μC and mass 10.0 mg moving along the y-axis. If Q3Q3 starts from rest at y=2.00cm,y=2.00cm, what is its speed when it reaches y=4.00cm?
1- Two charges Q1(+2.00μC)Q1(+2.00μC) and Q2(+2.00μC)Q2(+2.00μC) are placed symmetrically along the x-axis at x=±3.00cmx=±3.00cm. Consider a charge Q3Q3 of charge +4.00μC+4.00μC and mass 10.0 mg moving along the y-axis. If Q3Q3 starts from rest at y=2.00cm,y=2.00cm, what is its speed when it reaches y=4.00cm?
2- Two parallel plates have equal and opposite charges. When the space between the plates is evacuated, the electrical field is E=3.20×105V/mE=3.20×105V/m. When the space is filled with dielectric, the electrical field is E=2.50×105V/mE=2.50×105V/m. (a) What is the surface charge density on each surface of the dielectric? (b) What is the dielectric constant?
3- A capacitor is made from two flat parallel plates placed 0.40 mm apart. When a charge of 0.020μC0.020μC is placed on the plates the potential difference between them is 250 V. (a) What is the capacitance of the plates? (b) What is the area of each plate? (c) What is the charge on the plates when the potential difference between them is 500 V? (d) What maximum potential difference can be applied between the plates so that the magnitude of electrical fields between the plates does not exceed 3.0 MV/m?
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