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What is the potential difference between points d and a -

1. The electric potential at a point on the axis of a ring of charge of radius R=3 m is

v = 1/4Πε_{0} Q/ √z^{2} + R^{2}

Q = 125 nC. If a point charge q = 15 nC is located at z = 4 m, find the net force exerted on the charged particle by the ring.

2. Two concentric spheres of radius R_{1}= 3 m and R_{2} = 6 m are shown below. Each charge has a charge Q = 9 nC.

(a) What is the potential difference between points D and A

(b) What is the workdone when a point charge q = 2 nC is carried from A to B?

(c) What is the work done on the point charge q = 2 nC when it is carried from B to C?

3. A thin, uniformly charged rod of length L = 4.0 m with a linear charge density λ. = 1/9 nC/m lies along the x-axis as shown below. Find the electric potential difference at point P a distance d = 3 m from the origin.

4. Four charged particles at the corners of a rectangle is shown below. If a fifth charged particle with Q = 4C is carried from infinity and placed at point P---the center of the rectangle, what is the potential enerelof the fifth particle?

5. Point P in the figure shown below is a distance d_{1} = 4.00 m from Q_{1} (Q_{1} = -2e) and a distance d_{2} = 2.00 m from Q_{2} (Q_{2}= +2e) with both Q_{1} and Q_{2} fixed in place.

(a) With V = 0 at infinity, what is Vat point P?

(b) If we bring a particular charge Q_{3} (Q3= +2e) from infinity to point P, how much work do we do?

(c) What is the potential energy of the three-particle system?

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