# Electrostatic and Circuits Problems

Please answer the following in the attached document.

7. Electrons leave the cathode of a TV tube at essentially zero speed and are accelerated toward the front by 10,000 V potential. At what speed do they strike the screen? Express this value as a fraction of the speed of light.

8. A charge of -4.00μ C is fixed in place. From a horizontal distance of 55.0cm, a particle mass 2.50 x 10^-3 kg and charge -3.00μC is fired with an initial speed of 15.0m/s directly toward the fixed charge. How far does the particle travel before it stops and begins to return back?

9. In the figure to the right, find the magnitude and direction of the electric field at points A, B,C and D. (See attachment for figure)

10. In question 9, calculate the work needed to move a 1.5μC test charge from point B to point D.

11. A 15μ F capacitor is connected to a 55 V battery and becomes fully charged. The battery is removed and the circuit is left open. A slab of dielectric material is inserted to completely fill the space between the plates. It has a dielectric constant of 4.8. What is the voltage across the capacitor plates after the slab is in place?

See attachment for following questions.

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#### Solution Preview

7. Electrons leave the cathode of a TV tube at essentially zero speed and are accelerated toward the front by 10,000 V potential. At what speed do they strike the screen? Express this value as a fraction of the speed of light.

When a charge q travels through ...

#### Solution Summary

The solution uses detailed steps to solve 12 different problems, varying in subjects from electric field to Kirchhoff analysis.