Question

An alpha particle with mass of 6.64 x10-27 kg and a charge of +2e is moving...

An alpha particle with mass of 6.64 x10-27 kg and a charge of +2e is moving horizontally with a velocity of 2.5 x 105 m/s as it goes through a small opening in the middle of two charged conducting plates. If the plates are spaced 15 cm apart, what is the strength of the electric field needed to stop the particle before it hits the opposite plate?

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Answer #1

The initial kinetic energy can be found by initial speed. Final speed will be zero because the particle stops. Use work energy theorem to find the strength of electric field as shown below

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