A charge Q = - 810 nC is uniformly distributed on a ring of 1.8 m radius. A char
ID: 2287107 • Letter: A
Question
A charge Q = - 810 nC is uniformly distributed on a ring of 1.8 m radius. A charge q=+484 nC is placed at the center of the ring. Points A and B are located on the axis of the ring, as shown. In Figure, the work in eV (as a whole number) done by an external force that transports an electron from B to A is:
5 points Save Answer A charge Q =-810 nC is uniformly distributed on a ring of 1.8 m radius. A charge q:+484 nC is placed at the center of the ring. Points A and B are located on the axis of the ring, as shown. In Figure, the work in eV (as a whole number) done by an external force that transports an electron from B to A is: 1.8 m A 51.8m 41.4m B QUES TION 3 5 points Saved A conducting sphere of radius 29 cm carries an excess charge of +q=19 nC, and no other charges are present. The potential relative to infinity (as a whole number) due to this sphere at a point R-12 cm from its center is: 589.655 Click Save and Submit to save and submit. Click Save All Answers to save all answers. Screenshot Added Save All AnsweA screenshot was added to your Dropbox. bmit 11:50 AM 2/5/2015Explanation / Answer
Electrci potential at point A,
VA = k*q/x1 + k*Q/sqrt(r^2+x1^2)
= 9*10^9*484*10^-9/1.8 - 9*10^9*810*10^-9/sqrt(1.8^2+1.8^2)
= -443.8 volts
Electrci potential at point B,
VB = k*q/x2 + k*Q/sqrt(r^2+x2^2)
= 9*10^9*484*10^-9/3.2 - 9*10^9*810*10^-9/sqrt(1.8^2+3.2^2)
= -624.3 volts
Workdone = q*(vA - vB)
= -1.6*10^-19*(-443.8-(-624.3))
= -288.8*10^-19 J
= 180.5 eV <<<<<<<------------Answer
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