# Physics 2: Electric Forces and Fields

In the figure below, L = 1.0 mm, q$_1$ = +3 nC, q$_2$ = -2 nC, and q$_3$ is +4 nC. Find the magnitude and direction of the net electrostatic force on q$_3$

What is the direction of the electric field at the center of the square?

Two charged plates are set up as pictured below. A charged ball of mass m and charge q is to be thrown between the plates with initial velocity V$_0$. The ball is a vertical distance, d, from either of the plates. Find how far down range the ball travels.

A charged ball of mass m and charge Q is hung from a mass less pendulum. A uniform electric field along the horizontal causes the pendulum to swing up an angle $\theta$. Find the magnitude of the electric field.

An electron is released from rest at the surface of a very large plate of charge density -50 $\frac{nC}{m^2}$ . How long will it take for the charge to move 10 cm?

Below is a figure depicting a uniform electric field, E = 400 N/C at an angle $\theta$ = 40$^\circ$ above the horizontal. The red line represents a rectangle, going into the page, with area, A = 0.20 m$^2$. Find the electric flux through the rectangle.

A uniformly charged sphere has a radius of 40 cm and a total charge of 80 nC spread throughout its volume. If the following sections were removed from the sphere, how much charge would they contain?

A. A Spherical section with a radius of 10 cm

B. A cubical section with sides of 5.0 cm

C. A cylindrical section with radius 8.0 cm and length 15 cm