Run the \"Faraday\'s Electromagnetic Lab\" simulation: http://phet.colorado.edu/
ID: 1409308 • Letter: R
Question
Run the "Faraday's Electromagnetic Lab" simulation: http://phet.colorado.edu/en/simulation/legacy/faraday (you will need to click the play button download it)
Go to the "Electromagnet" tab. There you will see a battery connected to a 4-loop coil, and a compass. Notice the direction that the compass needle is pointing. Also notice the directions of the tiny red and white magnetic field indicators.
Look carefully at the battery; you will see a slider control on the battery. Slide it all the way to the left, then to the right, then to the left again. Do this several times, without changing anything else. What effect(s) does this have on the magnetic field? (NOTE: It may help to "Show the Field Meter" by checking that box.) Choose all the answers that apply.
a. There is a position of the battery slider control for which the magnetic field is zero.
b. The field changes direction as you move the control all the way to the left, then all the way to the right.
c. The field alternately gets weaker, then stronger, then weaker again, then stronger again, as you move the slider back and forth.
d. The field is weaker when the battery slider control is all the way to the right than it is when the slider is all the way to the left.
e. There is no change to the field as you change the number of coils.
f. The field is weaker when the battery slider control is all the way to the left than it is when the slider is all the way to the right.
Explanation / Answer
a. There is a position of the battery slider control for which the magnetic field is zero.
TRUE
b. The field changes direction as you move the control all the way to the left, then all the way to the right.
TRUE
as the slider changes current changes its direction
c. The field alternately gets weaker, then stronger, then weaker again, then stronger again, as you move the slider back and forth.
TRUE
as the current changes it also change its magnitude
d. The field is weaker when the battery slider control is all the way to the right than it is when the slider is all the way to the left.
FALSE
e. There is no change to the field as you change the number of coils.
FALSE
Field depends on number of turns
f. The field is weaker when the battery slider control is all the way to the left than it is when the slider is all the way to the right.
TRUE
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