2. The clcctron beam inside a television picture tubc is 0.40 mm in diameter and carries a current of 50 µA. This clectron beam impinges on the inside of the picture tube screen. (a) How many clectrons strike the screen cach second? (b) What is the current density in the electron beam? (c) The clectrons move with a velocity of 4.0 × 107 m/s. What electric ficld strength is needed to accelerate clectrons from rest to this velocity in a distance of 5.0 mm? (d) Each clectron transfers its kinetic energy to the picture tube screen upon impact. What is the power delivered to the screen by the clectron beam?

2. The clcctron beam inside a television picture tubc is 0.40 mm in diameter and carries a current of 50 µA. This clectron beam impinges on the inside of the picture tube screen. (a) How many clectrons strike the screen cach second? (b) What is the current density in the electron beam? (c) The clectrons move with a velocity of 4.0 × 107 m/s. What electric ficld strength is needed to accelerate clectrons from rest to this velocity in a distance of 5.0 mm? (d) Each clectron transfers its kinetic energy to the picture tube screen upon impact. What is the power delivered to the screen by the clectron beam?

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter30: Magnetic Fields And Forces

Section30.3: Ørsted’s Discovery

Problem 30.2CE

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