# 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 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):

#### Earn Coin

Coins can be redeemed for fabulous gifts.

Similar Homework Help Questions
• ### 7 Ideal Solenoid - prediction To find out whether the Slinky is a good realization of...

7 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 B1 (near the center of the loop, in the middle of the Slinky). Decide whether the value should be the same, larger, smaller or zero. B. B6 COOOO000 B. B2 B3 BA Hypothesis...

• ### 4) With FlipltPhysics you have already found the field due to a circular loop of radius R carryin...

4) With FlipltPhysics you have already found the field due to a circular loop of radius R carrying current I at a point a distance x from the center of the loop but along the axis. A pair of such loops placed a distance R apart makes up a Helmholtz coil. Such a coil is used in the e/m ratio lab (a) Determine the magnetic field as a function of x along the axis of a Helmholtz coil, with x...

• ### III. Extension to calculating the magnetic field on the axis of a solenoid . y! R...

III. Extension to calculating the magnetic field on the axis of a solenoid . y! R A solenoid has a length of Land is comprised of N coaxial loops with radius R. All of the loops are connected so that they all carry the same current in the same direction. You want to determine the field at a point on the y axis. In the previous example you calculated the magnetic field ^ due to one loop. This is an...

• ### PreLab 3 Magnetic Fields Name: Lab Section: Lab Date: /_ / Name of PHY 109 Lab...

PreLab 3 Magnetic Fields Name: Lab Section: Lab Date: /_ / Name of PHY 109 Lab Instructor: Instructions: Prepare for this lab activity by answering the questions below. Note that this is a Prelab.lt must be turned in at the start of the lab period. Time cannot be given during the lo stivity for Prelab work. After the start of lab activities, PreLabs cannot be accepted Before beginning this assignment, you should review the topic of magnetic fields in your...

• ### (4) With FlipltPhysics you have already found the field due to a circular loop of radius R carryi...

(4) With FlipltPhysics you have already found the field due to a circular loop of radius R carrying current I at a point a distance x from the center of the loop but along the axis. A pair of such loops placed a distance R apart makes up a Helmholtz coil. Such a coil is used in the e/m ratio lab. (a) Determine the magnetic field as a function of x along the axis of a Helmholtz coil, with x...

• ### vi) x R A proton is moving in circle in a uniform magnetic field with a...

vi) x R A proton is moving in circle in a uniform magnetic field with a circular trajectory as shown. Draw the velocity vector for the proton on the diagram. (vii) The Northern Lights caused by (A) Magnetic lightning at the North Pole TBL Meteorites heating up in the Earth's magnetic field TQOscillating magnetic particles colliding with electrons (D)Charged particles moving parallel the Earth's magnetic field TESanta using LED's in his factory. ( Charged particles spiraling in the Earth's magnetic...

• ### show your work An ideal solenoid generates a uniform magnetic field inside the solenoid. Here we...

show your work An ideal solenoid generates a uniform magnetic field inside the solenoid. Here we place two long ideal solenoids as shown (with radii 40 mm and 20 mm, respectively). The current carried by the outer solenoid It is three times as large as the current carried by the inner solenoid I2. In order to make the magnetic field inside the inner solenoid zero, what should be the ratio of the number of turns per unit length for the...

• ### A proto is movine in circle i uniform magnetic field with a circular trainctory a shown...

A proto is movine in circle i uniform magnetic field with a circular trainctory a shown Drow the velocity vector for the prison on the diagram (viD The Northern Lights caused by A Magnetic lightning at the North Pole TL Meteorites heating up in the Earth's magnetic field To Oscillating magnetic particles colliding with electrons Charged particles moving parallel the Earth's magnetic field Santa using LED's in his factory ( Charged particles spiraling in the Earth's magnetic field ved particles...

• ### Magnetic Field. I have no idea how to solve these questions, please help!!!! MAGNETIC FIELDS SUMMARY...

Magnetic Field. I have no idea how to solve these questions, please help!!!! MAGNETIC FIELDS SUMMARY You will measure how the magnetic field, B, produced by a coil varies with the current, I, in the coil. From your measurements, you w calculate the permeability constant Ho. Lastly you w use a magnet to induce a voltage in the coil. THEORY The magnetic field Batthe center of a circular coil (solenoid) of radius R with N turns that carries a current...