# physics due tomorrow

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Question description

Electric Field and Electric Force

In this lab you will be utilizing a simulation

to investigate the electric force and

electric field. After you have logged in to

the computer, open the browser and

charges-and-fields/charges-andfields_

en.html. Wait for the simulation to

load. After it does, check the boxes for

“Show E-field,” “grid,” and “Show

numbers.” Then take a few minutes to

familiarize yourself with how the

simulation works. Go ahead... Iʼll wait...

Part I:

Place a +1 nC charge on the field. It is helpful to place it on the intersection of two dark

lines. Assume that this charge is located at the origin. Place an E-field Sensor at each of

the following locations, and complete the data in the table. (note: 1 V/m = 1 N/C)

X Y r (m) Field Strength (N/C) Direction (degrees)

1 m 1 m

2 m 2 m

-1 m 1 m

0.5 m -1 m

Part II:

We will now replace the +1 nC charge with a -1 nC charge. Before you make the

change, predict what changes you will see in the table:

Now, exchange the +1 nC charge for a -1 nC charge. Make sure the +1 charge is

completely removed from the grid, or it will affect your data. Complete the table for the

new charge arrangement.

X Y r (m) Field Strength (N/C) Direction (degrees)

1 m 1 m

2 m 2 m

-1 m 1 m

0.5 m -1 m

Part III:

We will now investigate the Efield

associated with a multiple

charge arrangement. This time,

place a +1 nC charge at one

point and place a -1 nC charge

2m to the right of the positive

charge. To give ourselves a

frame of reference, we will

establish a point in the middle of

this arrangement as the origin,

so that our positive charge will

be located at coordinates (-1,0)

and the negative charge will be

at (1,0). Your grid should now

look like this:

Place an E-Field Sensor on each of the following “coordinates” and complete the table

with the needed information.

X Y rpositive (m) rnegative (m) Field Strength

(N/C)

Direction

(degrees)

0 m 0 m

0 m 1 m

-1.5 m 1 m

0.5 m -1 m

Part IV: Analysis

1) For part 1, calculate what the value for the E-field should be for a +1 nC charge at a

distance of 1.414 m (that is the square root of 2). Assuming your calculated value is

correct, compute the percent error for the computer simulation.

2) Why do you think the error found in question 1 is present?

3) For Part III, where on the grid is the field the strongest? Is there anywhere on the grid

that the field equals zero?

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