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For many technical applications, it is desirable to have a uniform magnetic field, i.e. a field...

For many technical applications, it is desirable to have a uniform magnetic field, i.e. a field with the same strength and diQuestion 9: When determining the number of turns one needs to consider the number of full turns (the number should be an intePhys 259, Labatorial 8, Summer 2020 B B6 Cooooooo B B2 B3 B4 Hypothesis for ideal solenoid (see also the figure above): 1. Ne

For many technical applications, it is desirable to have a uniform magnetic field, i.e. a field with the same strength and direction at every point in a certain region of space. As you discovered in the last checkpoint, this can be achieved with a solenoid, which is constructed by "stacking" many loops of wire, each with the same current. The superposition of the magnetic fields of the single loops creates a strong, nearly uniform field inside the solenoid, whereas the field on the outside is weak and is approximately zero. 4 The magnetic field near the centre of an ideal solenoid is given by B = Honl, where Ho = 41 x 10-7 T-m/A is the magnetic constant, I is the current that runs through the solenoid, and n = N/L is the number of turns per unit length. Note that the magnetic field does not depend on the radius of the solenoid. Question 7: You are given a solenoid with n = 100 turns per meter and are asked to generate a magnetic field inside the solenoid that is large enough to cancel the magnetic field of the earth, the average value of which is 5 x 10-5 T on the surface of the earth. How big does the current have to be? Question 8: If you want this current to be as small as possible (for the magnetic field given in the previous question), should the solenoid be stretched or compressed? Answer this question by finding an algebraic expression for I in terms of n first, and then write your explanation.
Question 9: When determining the number of turns one needs to consider the number of full turns (the number should be an integer). Consider a charge starting at point "0" and travelling couterclockwise as indicated by an arrow (see the figure below). How many full rotations does the charge complete when it reaches point "1"? lom 20 cm Question 10: How many full turns, N can you see in the region above the object of length L = 20 cm? How many turns per meter, n, does the solenoid shown in the figure above have? Show your calculations in the space below. 3 Ideal Solenoid - prediction To find out whether the Slinky is a good realization of an ideal solenoid, we will explore the magnetic field in the Slinky qualitatively. For each of the following regions, predict the results of the net magnetic field compared to the value B (near the center of the loop, in the middle of the Slinky). Decide whether the value should be the same, larger, smaller or zero.
Phys 259, Labatorial 8, Summer 2020 B B6 Cooooooo B B2 B3 B4 Hypothesis for ideal solenoid (see also the figure above): 1. Net magnetic field B. (near the center of the loop, in the middle of the Slinky): B = B 2. Net magnetic field B2 (near the edge of the loop, in the middle of the Slinky): 3. Net magnetic field B3 (near the center of the loop, at the end of the Slinky): 4. Net magnetic field B. (near the edge of the loop, at the end of the Slinky): 5. Net magnetic field Bs (outside of the loop, near the middle of the Slinky): 6. Net magnetic field Be outside of the loop, near the end of the Slinky):
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7 n I and carrying L and n will decrease. som let consider a Solenoid of Length L, number of turn/ length an > B. current I T

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