6. A circular loop of wire is placed in a uniform magnetic field pointing into the page, as shown below. The strength of the field is 10 Tesla. The wire loop has a radius of 0.01 meter. (The area of a circle is tr².) There is a 0.2 A current in the wire, going clockwise. Find the magnitude and direction of the torque (if any) on the loop. Find the potential energy of the loop. а. b. ХXXXX XXXX В X X X XXX X X X XX X X X X X X X XX XXX x X

Suppose you wish to produce a 1-T magnetic field in a toroid with an iron core for which magnetic susceptibility is x = 3 x 10³. The toroid has a mean radius of 14 cm and is wound with 600 turns. Hint a. What current is required to produce this magnetic field in the iron core? Current of b. For comparison, what current is required to produce the same magnetic field in an air-filled toroid of same geometry? Current of A is needed. Submit Question A is needed for toroid with no iron core. While it is not always practical to have region of magnetic field filled with ferromagnetic materials, this dramatic increase in strength of magnetic field produced is useful in some applications you will see in upcoming chapters. Question Help: Message instructor

1. A student uses a coil of radius 14 cm with 90 windings.a) Calculate the expected slope for a plot of magnetic field vs current in this coil.b) She performs the lab and measures a slope of 4.2 x 10^-4 T/A. Based on this slope, what valuedoes she calculate for μo ?c) Calculate the percent error between her measured value of μo and the theoretical value.2. She then uses a permanent magnet of strength B = 0.5 mT to induce a voltage in the (same) coil.Calculate the expected voltage if she pulls the magnet from the coil in 0.02 seconds.

Mono-ionized atoms (an electron withdrawn) are accelerated and then passed through a speed selector made up of perpendicular electric and magnetic fields. The electric field is 155 V / m and the magnetic field is 0.0315 T. The ions then enter a uniform magnetic field of modulus 0.0175 T which is oriented perpendicular to their speed.at. How fast do the ions move as they emerge from the speed selector?b. If the radius of the path of the ions in the second magnetic field is 17.5 cm, what is their mass?

QUESTION 23 In generating electricity, a magnet, surrounded by wires connected to the electrical grid, will be made to spin, using wind, a steam turbine, or moving water. Which answer best explains what is happening in the wires during this process.   a. The magnet does not need to move, and still has the capability to make electrons move in the wires that surround it.   b. An induced voltage and current flow is set up in the wires surrounding a magnet due to changes in magnetic temperature.   c. A magnetic field surrounds the rotating magnet, pushes on the electrons in the wires, thus giving those electrons energy per charge (voltage).   d. Light from the magnet is able to push electrons out of the material that makes up the wires. In so doing, the wires are made to have a flowing electrical current.

a. The magnitude of the magnetic field at a distance R from a long straight wire is equal to B. At what distance will the magnitude of the magnetic field be equal to 3B? b. Two long parallel wires carry equal but opposite currents. Are there any points in space where the total magnetic field is equal to zero? If so, where? If not, why not? C. A simple loop circuit contains two sources, a resistive wire, and a switch. It is placed next to a long straight wire carrying a steady current. As soon as the switch is closed, the loop is suddenly pulled towards the long wire. Which source has a greater emf? Justify your answer. eHe E2

1) A straight, stiff, horizontal wire of length 48 cm and mass 28 g is connected to a source of emf by light, flexible leads. A magnetic field of 1.33 T is horizontal and perpendicular to the wire. Find the current necessary to float the wire, that is, find the current for which the magnetic force balances the weight of the wire. A Submit You currently have 0 submissions for this question. Only 10 submission are allowed. You can make 10 more submissions for this question.

6. A wire is formed so as to make a circular loop connecting two long, straight sections as shown in Figure 6. If the radius of the loop is R = 20 cm and the wire carries a current I = 2.4 A, what are the magnitude and direction of the magnetic field at the center of the loop? I If needed, you can use the magnetic field due to a straight wire, and and the magnetic field at the center of a loop derived from Ampere's law. (Hint: The two long sections form one long straight current- carrying wire.)

4. A wire is bent into the shape shown in Figure 4. If a = 20 cm and I = 12 A, calculate the magnetic field at point P. Ans.: 8.26 x 10-5 T, out of page CO a/2 a a/4 P. Figure 4.

A circular coil of 50 turns and radius 8.0cm is placed with its plane oriented at  90 degrees to a magnetic field of .20 T. the field is now increased at a steady rate, reaching a value of .80T after 3.0 seconds. What emf is induced in the coil?  a. 40V b. 0V c. 0.20V d. 0.0040V e. 2010V