(a) An positron (electron with a positive charge) starts at rest and accelerates through an electric field established by a set of parallel plates with a potential difference of 35 V. What is the speed of the positron the instant before it hits the negative plate? (e = 1.6 × 10-19 C, melectron = 9.1 × 10-31 kg) (b) Instead of hitting the negative plate, the positron, travelling East, escapes the parallel plates through a small hole and enters a magnetic field of 0.75 T directed downward. What will be the magnetic force (magnitude and direction) on the charge? (c) Once the positron has entered the magnetic field, it is in circular motion. What is the radius of the positron's circular path?
(a) An positron (electron with a positive charge) starts at rest and accelerates through an electric field established by a set of parallel plates with a potential difference of 35 V. What is the speed of the positron the instant before it hits the negative plate?
(e = 1.6 × 10-19 C, melectron = 9.1 × 10-31 kg)
(b) Instead of hitting the negative plate, the positron, travelling East, escapes the parallel plates through a small hole and enters a magnetic field of 0.75 T directed downward. What will be the magnetic force (magnitude and direction) on the charge?
(c) Once the positron has entered the magnetic field, it is in circular motion. What is the radius of the positron's circular path?
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