Experiment 6

Electromagnetic  Radiation Lab

 

in this lab we will be analizing the electric fieal of an electromagnetic wave. This will be done by simulating a transmiter and a receiver. we will be investigating the electromagnetic variation in a receiver due to the distance of the transmiter.

 

 

here is some picture of how will the set up will look like.

 

 

 

 

 

 

we performed 3 tests to verify that the signal we were viewing on the osccilloscope is generated by the transmiter.

• moving the transmiter forward and bacwards.
• increasing the frequency and observing if the amplitude changed
• removing the transmiter to see if there is any signal in the oscilloscope

 

 

 

this is the data obtained as we moved the transmiter away from our antena.

 

 

here is our graph of position and peak to peak amplitude ther is a fit of 1/r and 1/r^2

 

 

the best fit fot this data is 1/r^2. this is true due to the fact that electromagnetic waves behave more like  1/r^2 in shorter distances.

 

here is the derivation in obtaining an equation for voltage.

 

 

now solving for Q in we obtain this equation. this equation will be used to find our total charge in the transmiter.

 

since we found Q, we can now find our theoretical values for our voltages.

 

 

here is the procedure in obtaining the uncertainity for each value

 

in sumary, we found out that waves carry voltage and that this voltage depend on the distance from where the signal is being produce. There is sevaral asumptions in this experiment that lead to a high uncertainity. asumptios like evaluating the entire charge of the small antena as being perceived in the receiver.