1) In a certain region, the electric field along the x axis is given by E=ax+b,
ID: 3899789 • Letter: 1
Question
1) In a certain region, the electric field along the x axis is given by E=ax+b, where a= 40 V/m^2 and b= 4 V/m. The potential difference between the origin and x= 0.5m is...?
The answer is -7V
How do you get this answer(explanation)
2) In a region of space, a spherically symmetric electric potential is given as a function of r, the distance from the origin, by the equation V(r) = kr2, where k is a positive constant.
The answer is 2kr0
How do you get this answer(explanation)
3) How much net work must be done by an external force to move a -1
?C point charge from rest at point C to rest at point E?
The answer is -10?J
How do you get this answer(explanation)
Explanation / Answer
1) V = -integra of E dx = -integral of 40 x + 4 from 0 to 0.5 = -1*(20*0.5^2 +4*0.4)= -7 V
2) E = dV/dr = 2 k r0
3) W = q dV = -1.0E-6*( 20 - 10) = -10.0E-6 J = -10 uJ
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.