(d) An alpha particle (He 2+ , containing two protons and two neutrons) is relea

Question

(d) An alpha particle (He2+, containing two protons and two neutrons) is released from rest at location A. Use your answer from part (c) to determine the initial acceleration of the alpha particle. (Use 6.646 ? 10?27 kg for the mass of He2+.)

At a particular moment, one negative and two positive charges are located as shown in the figure. Your answers to each part of this problem should be vectors. It helps a great deal to make a diagram with arrows representing the various electric field contributions, and then check the signs of your components against these arrows.

Let Q1 = 2

Explanation / Answer

electric field at Q1 due to Q2,repulsive

E2=kQ2/0.042

electric field at Q1 due to Q3,attractive

E3=kQ3/0.052

so angle between E2 and E3=135 degrees

net E1=E2E3sin135

net force F1=E1Q1

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