Electric Field Video Lessons

Concept

# Problem: A uniform electric field exists in the region between two oppositely charged plane parallel plates. A proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate, 1.20 cm distant from the first, in a time interval of 3.80×10−6 sPart AFind the magnitude of the electric field.Part BFind the speed of the proton when it strikes the negatively charged plate.

###### FREE Expert Solution

The force that a charge experiences when placed at a point is given by:

$\overline{){\mathbf{F}}{\mathbf{=}}{\mathbf{q}}{\mathbf{E}}}$

We also need Newton's second law of motion here, which is expressed as:

$\overline{){\mathbf{\Sigma }}{\mathbf{F}}{\mathbf{=}}{\mathbf{m}}{\mathbf{a}}}$

Comparing the two equations:

$\overline{)\begin{array}{rcl}{\mathbf{qE}}& {\mathbf{=}}& {\mathbf{ma}}\\ {\mathbf{E}}& {\mathbf{=}}& \frac{\mathbf{m}\mathbf{a}}{\mathbf{q}}\end{array}}$

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###### Problem Details

A uniform electric field exists in the region between two oppositely charged plane parallel plates. A proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate, 1.20 cm distant from the first, in a time interval of 3.80×10−6 s

Part A

Find the magnitude of the electric field.

Part B

Find the speed of the proton when it strikes the negatively charged plate.

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Electric Field concept. You can view video lessons to learn Electric Field. Or if you need more Electric Field practice, you can also practice Electric Field practice problems.