What is the minimum magnitude of an electric field that balances the weight of a plastic sphere of mass 6.4 g that has been charged to -3.0 nC?

An electric field E = 1.5x106 N/C right, causes the 6.0g ball to hang at an angle of 35 degrees with the vertical. Calculate the charge on the ball. Two 3.0 g point charges on 1.0 m-long thread repel each other after being equally charged. What is the charge q?

A friend is working on a biology experiment and needs to create an electric field of magnitude 430 N/C at a distance of 10 cm from the central portion of a large nonconducting square plate 4.5 m on each side. She needs to know how much charge to put on the plate. What do you tell her?

What magnitude of a point charge needed to create a 17100 N/C electric field at a distance of 0.244 m?   How large is the field at 13 m?

Your receipt no. is 153-9195 6. An electron is released from rest on the axis of a uniform positively charged ring, 0.111m from the ring's center. If the linear charge density of the ring is +0.147nC/m and the radius of the ring is 0.222m, how fast will the electron be moving when it reaches the center of the ring? 8.86x10^-17 m/s Submit Answer Incorrect. Tries 7/10 Previous Tries 4. A wire of finite length that has a uniform linear charge density A=5.58E-9C/m is bent into the shape shown below. Find the electric potential at point O. 2.68×10² V You are correct. Your receipt no. is 153-1123 Previous Tries

Two coaxial 10-cm-diameter uniformly charged rings face each other, 10 cm apart. Both rings are charged to +10 nC. What is the electric field at the center of one of the rings?

You charge a piece of aluminum foil (mass 7.37 g) by touching it to a charged rod. The charged rod gives the aluminum foil a charge of -10 uc. Your professor brings a charged plate over and tells you to put the aluminum foil on top of the plate. To your surprise the aluminum foil hovers motionless in the air above it! Calculate the value of the electric field from the charged plate (assume is a uniform field and the aluminum foil is a point charge). N/C magnitude direction -Select- Additional Materials Pation

Two point charges lie along the y-axis. A charge of q1 = -8 ?C is at y = 6.0 m, and a charge of q2 = -7 ?C is at y = -4.0 m. Locate the point (other than infinity) at which the total electric field is zero.

A small sphere is electrically neutral before 2.4 x 1011 electrons are added to it. At a distance of 13 cm from the center of the sphere what is the magnitude of the electric field and what is its direction (toward or away from the sphere)?

Two pieces of tape are stuck together, and then ripped apart, forming an electric dipole with one piece of tape at +0.20nC, the other at -0.20nC, held 3.0cm apart from each other. What is the electric field at a point positioned 10.0cm from the positive charge and 13.0cm from the negative? provide an answer with correct significant figures.