Question

Using figure 6 below, estimate the number of coils per meter (nl) in Solenoid Ithat are visible. Does this coil have multiple layers? If so, approximately how many would you say? Show your estimate here Figure 6. Showing coils and contimeter scale. Note that the full length of the solenoid is not Now, with the power supply connected to Solenoid with a current of 10 A, und the current directions identical to figure 5. We will record the magnetic field of the solenoid at a variety of distances from its center. The data is included below in table 3. Graph the data and include with your report. You may want to reference it when providing descriptions below Does the magnitude of the field remain relatively uniform, increase or decrease substantially as you move away from the center while still inside the solenoid! You can assume a change of less than 23% is fairly constant o

Answer 1

A) According to the figure shown, it can be counted that in one cm there are 11 turns, therefore usig the relation.

$n=\frac{N}{L}=\frac{11}{1cm}=11cm^{-1}=1100m^{-1}$

This calculus is for ona layer, thus, if the coil have several layers then, the number of coil per meter is:

$n_t=tn=t(1100m^{-1})$

where t es el numero de capas. In the image the coil has at least 3 layers. Therefore

$n_t=tn=3(1100m^{-1})=3300m^{-1}$

B) as long as you are measuring the magnetic field inside the solenoid, it remains constant as stated in the expression

$B=\mu_0nI$

Therefore it not depends of the position inside the soleniod, as long as it is not measured near the ends.

The magnetic field it is smaller with respect to the field in the center of the solenoid, since the equation is valid in the vicinity of the center.