The stopping voltage for an electron travelling at 3.5 * 10^6 m/s is? Two very s

Question

The stopping voltage for an electron travelling at 3.5 * 10^6 m/s is? Two very small spheres have charges of 3.0 mu C and -6.0 mu C are place 2.0 cm a way from each other. The magnitude of the electric force on each sphere is? Two identical objects, one neutral and other with a charge of +4.0 mu C, are brought into contact and then separated to distance of 0.25 m. Calculate the magnitude of the electrostatic force between the two charged objects. 0.14 N 0.58 N 1.4 * 10^11 N 5.8 * 10^11 N A uniform electric field of 440N/C exists between two large metal plates that are 40 cm apart. The potential difference between the plates. 1.8 * 10^4 V 1.1 * 10^3 V 1.8 * 10^2 V 1.1 * 10^2 V A 8.20 * 10^15 kg oil drop is moving upwards at a constant speed of 1.60 m/s between two horizontal parallel plates. If the electric field strength between the plates is 2000 V/m, determine the magnitude of the drops charge 2.51 * 10^-2 C 2.51 C 1.6 * 10^-19 C 4.0 * 10^-17 C

Explanation / Answer

by conservation of energy

initial energy = final energy

0.5 * mass * velocity^2 = charge * stopping voltage

0.5 * 9.109 * 10^-31 * (3.5 * 10^6)^2 = 1.6 * 10^-19 * stopping voltage

stopping voltage = 34.87 V

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