need help in detail with this question! We did a lab on AC fields and in this se
ID: 1402301 • Letter: N
Question
need help in detail with this question!
We did a lab on AC fields and in this section of the lab, a coil with N = 800 turns was used and clamped to a ring stand. Then a magnet wand was shaked back and forth through the coil and the relationship between maximum voltage across the coil and maximum speed of the magnet across the coil was observed. We observed that the faster you shake the magnet wand the higher the voltage with large peaks and high amplitudes. Then we Slided the clear end of the magnet wand into the coil and holded the black magnet end just above the top of the coil and then dropped the wand through the coil. Then we Inserted the clear end of the magnet wand into the coil so that about half of the wand was above the coil and then we dropped the wand again through the coil as shown in figure 1:
Explain why the voltage “pulses” before and after the zero-crossing were asymmetric. This was especially noticeable in the trial in which the magnet was held just above the coil’s opening. What would be different about the data if we had used a coil with N = 200-turns?
The graphs for dropping the wand first time and then second time through the coil is shown below: The graph shows Voltage Vs time graph
Magnet Wand Clamp "Voltage Sensor" Coil Tripod Stand Channel A A BC 1 2 3 4 Output Data Studio InterfaceExplanation / Answer
We know according to the lenz law that whenever there is change in magnetic field emf is induced.
So E = - Nd(phi)/dt where Phi is magnetic flux
And we also know that
E = BVl where B is magnetic flux , V is velocity and l is length
So whenever the speed is high the value of induced EMF is high.
and whenever the change in flux is zero the induced emf will be zero.
And as we can see from the formula that our induced emf
is directly proportional to the N i.e the no. of turns therefore
On decreasing the value of N we will see drop in the amplitude of the voltage.
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