University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter2: Vectors
Section: Chapter Questions
Problem 21CQ: What is wrong with the following expressions? How can you correct them? (a) C=AB , (b) C=AB , (c)...
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Question
Within the green dashed circle show in Figure P30.21, the magnetic field changes with time according to the expression B = 2.00t 3 − 4.00t 2 + 0.800, where B is in teslas, t is in seconds, and R = 2.50 cm. When t = 2.00 s, calculate (a) the magnitude and (b) the direction of the force exerted on an electron located at point P, which is at a distance r = 5.00 cm from the center of the circular field region. (c) At what instant is this force equal to zero?
![Figure P30.21
X X x X x
x x x x x x x
X X X x x X
X x x x Rx
x x x x × x
X X x X X](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2f15226b-c01b-49ad-9b84-6ad74eebad19%2F5e444603-cf49-4cbd-890f-cb1d6e3f06d3%2Fho31bw.png&w=3840&q=75)
Transcribed Image Text:Figure P30.21
X X x X x
x x x x x x x
X X X x x X
X x x x Rx
x x x x × x
X X x X X
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