# physics

posted by .

A thin ring of radius equal to 25 cm carries a uniformly distributed charge of 4.7 nC. What is the electric field and potential difference at the center of the ring?

• physics -

Because of symmetry, the field at the center is zero.

Since the potential due to charge element dq (relative to the value at infinity)is k dq/r, and all charges are equidistant from the center, the potential is k Q/R

k is the Coulomb constant. Q is the total charge. R is the ring radius

## Similar Questions

1. ### Physics

A thin ring of radius equal to 25 cm carries a uniformly distributed charge of 4.7 nC. What is the electric field and potential difference at the center of the ring?
2. ### Physics E&M

An electron is released from rest on the axis of a uniform positively charged ring, 0.100 m from the ring's center. If the linear charge density of the ring is +0.149 µC/m and the radius of the ring is 0.200 m, how fast will the electron …
3. ### Physics

Consider a charged ring of radius 43.4 cm and total charge 18 nC. We are interested in the electric field a perpendicular distance z away from the center of the ring. At what distance from the center of the ring does the electric field …
4. ### Physics (2)

Consider a charged ring of radius 43.4 cm and total charge 18 nC. We are interested in the electric field a perpendicular distance z away from the center of the ring. At what distance from the center of the ring does the electric field …
5. ### Physics and Calculus

Consider a charged ring of radius 27 cm and total charge 15 nC. We are interested in the electric field a perpendicular distance z away from the center of the ring. At what distance from the center of the ring does the electric field …
6. ### physics

please,i need help on this question:a thin circular ring of radius 20cm is charged with a uniform charge density(rho),if a small section of 1cm length is removed from the ring.calculate the electric field intensity at the center of …
7. ### Physics

A uniform thin ring of charge, with radius 5.20 cm and total charge 6.60 ìC, is located in the yz-plane and centered on the origin. (In other words, the x-axis passes through the center of the ring, and is perpendicular to the ring.) …
8. ### Physivs

A flat thin non-conducting ring has an inner radius and an outer radius . The disk is uniformly charged with charge per unit area . (a) What is the electric field at the center, , of the ring?
9. ### Physics

The electric field on the axis of a uniformly charged ring has magnitude 370kN/C at a point 6.2cm from the ring center. The magnitude 17cm from the center is 150kN/C ; in both cases the field points away from the ring.Find the ring's …
10. ### physics

Consider a thin spherical shell of radius 20.2cm with a total charge of 3.3μC distributed uniformly on its surface. a) Find the electric field, in N/C, at a radius of 15.6cm from the center of the charge distribution. b) Find …

More Similar Questions