1. What force does a 1.49*106 N/C field exert on a 2.37 μC charge on a...

1. What force does a 1.49*10⁶ N/C field exert on a 2.37 μC charge on a Van deGraaff’s belt?

2. Calculate the angular velocity ω of an electron orbiting a proton in the hydrogen atom, given the radius of the orbit is 0.65×10^-10 m . You may assume that the proton is stationary and the centripetal force issupplied by Coulomb attraction. Give answer in terms of 10¹⁶ rad/s.

3. How many coulombs of positive charge are there in 5.89 kg of plutonium, given its atomic mass is 244 and that each plutonium atom has 94 protons? Give your answer in millions of Coulombs.

4. By what factor must you change the distance between two point charges to change the force between them by a factor of 23? Hint: your answer should be greater than 1.

5. An amoeba has 0.989×10¹⁶ protons and a net charge of 0.5 pC. How many fewer electrons are there than protons? Give answer in terms of 10⁶ electrons.

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