A.) What is the strength of an electric field that will balance the weight of a

Question

A.) What is the strength of an electric field that will balance the weight of a 5.5 g plastic sphere that has been charged to -1.8 nC ? Express your answer to two significant figures and include the appropriate units.

C.) Part 1.) A uniform electric field exists in the region between two oppositely charged parallel plates 1.58 cm apart. A proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate in a time interval 1.46×10?6 s . Find the magnitude of the electric field. Use 1.60×10?19 C for the magnitude of the charge on an electron and 1.67×10?27 kg for the mass of a proton. Part 2.) Find the speed of the proton at the moment it strikes the negatively charged plate.

Explanation / Answer

a.)weight mg will be balanced by electrostatic force

mg = QE

E = mg/Q

E = (5.5 * 10^-3 * 9.8) / - 1.8*10^-9

E = -2.994 * 10 ^7 N/C

b.)

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