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In the figure a particle is to be released at rest at point A and then is to be accelerated directly through point B by an electric field. The potential difference between points A and B is 100 V. Which point should be at higher electric potential if the particle is (a) an electron, (b) a proton, and (c) an alpha particle (a nucleus of two protons and two neutrons, 4He)? (d) Compute the kinetic energies of these particles at point B, and rank them greatest first
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a) B is at higher potential.

b) A is at higher potential.

c) A is at higher potential.

d)
kinetic energy of electron = V*q
= 100* -1.6*10-19
= -1.6*10-17 J

kinetic energy of proton = V*qp
= 1.6 * 10 -17J

kinetic energy of alpha particles  =  V*qalfa
= 100* 2*1.6*10-19
= 3.2*10-17 J
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