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i Safari File Edit View History Bookmarks Window Help loncapa2.physics.se.edu LON-CAPA A circular plastic rod of radius R Chegg Study | Guided Solutions and Study H Chegg Study | Guided Solutions and Study H Eissa Mohamed Bamatraf (Student - section: 001) 2018 Spring, PHYS 212 (mishra) Messages Courses Help Logout Main Menu Course Co ntents Q Search Bo Notes " Bookmark Evaluate @ mmunicatePrint Info Course Contents » >> HW 2 » A circular plastic rod of radius R Favorites englishpage.com-Google Se.. ENGLISH PAGE-Verb Tense... (8e24p23) A circular plastic rod of radius R = 1.40 m has a positive charge = Q = 5.00x10-6 C uniformly distributed along one-quarter of its circumference and a negative charge of -7Q uniformly distributed along the rest of the circumference (see the figure). (At infinity V is zero) What is the electric potential at the center C of the circle? 1.28E5 V Submit Answer Incorrect. Tries 4/99 Previous Tries What is the electric potential at point P, which is on the central axis of the circle at a distance z 0.476 m from the center? 1.22E5 C Submit Answer Incompatible units. No conversion found between ".c" and the required units. Tries 1/99 Previous Tries is discussion is closed Send FeedbackExplanation / Answer
1) electric potential at C is
sum of V=k[q1+q2]/R where k=1/4.pi.e0=8.99*10^9
=k[q1-7q1]/R
k[-6q1]/R
=8.99*10^9[-6*5*10^-6]/1.4
= -192.64 kV
2) potential ar P is
sum of V=V1+V2=kq1/sqrt(R2+D2) + kq2/sqrt(R2+D2)
= k[-6q1]/sqrt(R2+D2)
= 8.99*10^9 * 6*5*10-6/sqrt(1.42+0.4762)
=182.47 kV
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