[Homework Home > Electric_Fields]

 [1] Three charges are arranged on an equilateral triangle as shown. Each side of the triangle is a= m . q1=+ \mu C , q2=+ \mu C , and q3=- \mu C . What is the electric field at the midpoint between q1 and q2?

 [2] Two charges are arranged on a horizontal line as shown. q1=+ \mu C and q2=- \mu C . Find the electric field at the point shown, given that the point and the two charges form an equilateral triangle. Each side of the triangle is a= m .

 [3] An object with charge q= \mu C and mass m= kg is at rest. Suddenly, an electric field with strength E= N/C is switched on. How fast is the object moving after t= s seconds?

 [4] A ball with mass m= kg containing a charge q= C is suspended by a thread as shown. An electric field of strength E= V/m is on as shown by the arrows. What is the tension in the thread?

 [5] A ball with mass m= kg containing a charge q=- C is suspended by a thread as shown. An electric field of strength E= V/m is on as shown by the arrows. What is the tension in the thread?

 [6] A ball with mass m= kg is suspended from a thread. When an electric field is turned on with strength E= N/C , the ball comes to equilibrium at a angle \theta= degrees . What is the charge on the ball?

 [7] An electron has a speed in the horizontal direction of v= m/s . It goes a distance d= m and stops. What is the strength of a horizontal electric field that could cause it to stop like this?

 [8] Two parallel, charged plates create an electric field between them as shown here. An electron is shot into a region where an electric field with strength E= N/C exists, as shown here. If the electron is shot in horizontally at v= m/s , just above the bottom plate, where will it strike the upper plate, given that the two plates are separated by a distance d= m ?

 [9] Two parallel, charged plates, both of length L= m create an electric field between them as shown here. An electron is shot into a region where an electric field exists, as shown here. If the electron is shot in horizontally at v= m/s , just above the bottom plate, how strong should the electric field be so that the electron just misses the top plate upon exiting the plates? The two plates are separated by a distance d= m ?

 [10] Two parallel, charged plates, both of length L= m create an electric field between them as shown here. At a distance a= m from the end of the plates is a screen. An electron is shot into a region where an electric field exists, as shown here. The electron is shot in horizontally at v= m/s , midway between the plates. The electric field has a strength of E= N/C . Assuming the electron doesn't hit the upper plate, how high above the "midway distance between the plates" will the electron hit the screen?

 [11] Two parallel, charged plates, both of length L= m create an electric field between them as shown here. An electron is shot into a region where an electric field exists, as shown here. The electron is shot in with a speed of v= m/s , at an angle of \theta= degrees , right at the left edge of the bottom plate. The electric field has a strength of E= N/C . Assuming the electron doesn't hit the upper plate, where will the electron strike the lower plate again?

 [12] A line of charge has a charge density of \lambda= \mu C/m . An electron is orbiting around the rod, at a radius of r= m as shown. What speed should the electron have to stay in this orbit?

 [13] Two parallel circular rings of radius R= m have their centers along the x-axis as shown, and are separated by a distance L= m . Each ring carries a charge Q= \mu C . What is the electric field at the point x= m on the x-axis?

 [14] An electron with a speed of v= m/s is traveling parallel to an electric field with magnitude E= N/C . How far will it travel before it stops? How much time will elapse before it returns to its starting point?