Homework Assignment #12 Begin Date: 2/19/2018 4:00:00 PM-Due Date: 2/26/2018 11:
ID: 1876043 • Letter: H
Question
Homework Assignment #12 Begin Date: 2/19/2018 4:00:00 PM-Due Date: 2/26/2018 11:59:00 PM End Date: 12/1/2018 11:59:00 PM (33%) Problem 2: A uniformly positively charged disk of radius R = a45 m is rotating with angular velocity = 4.9 rad s around an axis that is perpendicular to the plane of the disk and passes through the center of the disk. The net electric charge of the disk is Q= 5.5 mC. what is the magnitude of the magnetic dipole moment (in m2) of the disk? Grade Summary Deductions Potential 090 100% cosO Submissions Attempts remaining: 20 (0% per attempt) cotan asin co atan acotan) sinh(0 cosh() acosO detailed view tanh) cotanh) END Degrees Radians Submit I give up! Hints: 0 for a 0% deduction. Hints remainin : 0 Feedback: 0% deduction per feedback.Explanation / Answer
uniformly psitively charged disk :
R = 0.45 m
angular velocity w = 4.9 rad/s
Net charge o the disk , Q = 5.5 mC = 5.5 e-3 C
Q = sigma (pi*R^2)
5.5 e-3 C = sigma (pi*0.45^2)
sigma = 8.65 e-3
Magnetic moment of the disk , u = (pi/4)sigma*R^4 * w
u = (pi/4)(8.65e-3)*(0.45)^4 * 4.9
u = 1.36 uA.m2
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