Current (using conventional current) will start to run when the circuit is completed. 1) Using what we know about currents and magnetism. What will happen when the current runs through the loop? 2) Use the RHR and what we know about magnetism to draw the magnetic field (including arrows for direction) around the loop in the circuit.
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- The problem below explores the basic principles behind electric generators, which we will discuss in class in detail. A 505 turn circular loop coil with a diameter of 3.9cm is initially held perpendicular to the Earth's magnetic field. The coil is then rotated in 7.6ms by 90 degrees, so the plane of the coil is parallel to the magnetic field. The average emf induced in the coil is 7.2V. Find the value of the Earth's magnetic field (in T) inducing the current in the coil.As an approximation, assume that the magnetic flux in the coil changes at a constant rate between its maximum and minimum values. Note that (see the previous problem) the flux through the coil is 505 times larger than if it was made out of one wire loop.Short answer: (question 1 has two parts (a and b) to it. 1. A wire loop in the plane of the page carries a clockwise current. There is an external magnetic field pointing toward the top of the page. a. In what direction is the loop's magnetic dipole moment? b. What is the motion of the loop due to the external magnetic field? 2. A wire loop in the plane of the page does not initially contain a current. There is an external magnetic field pointing out of the page. If there begins to be an induced clockwise current in the wire loop, is the magnetic field increasing or decreasing in strength?I need a proper solution for this question ( well explained and understandable writing) In an AC generator, a coil with N turns of wire spins in a magnetic field. Of the following choices, which does not cause an increase in the emf generated in the coil? (a) replacing the coil wire with one of lower resistance (b) spinning the coil faster (c) increasing the magnetic field (d) increasing the number of turns of wire on the coil
- Note: Elaborate and provide a screenshot of your observation including the corresponding equation (applicable to all questions) F. Lasty, try putting the magnet in the loops and click the magnet flip button. What happens as you spin the magnet several times? G. Look at the Voltage needle as you spin it multiple times. What type of current do you think it is producing? AC or DC?E2 The two plates in figure 6 are infinite both in the directionof ?̂ as in ?̂. Determine the magnetic induction producedfor current distribution. ?⃗ =?0?̂ for− ? < ? < 0?⃗ = −?0?̂ for 0 < ? < aIn the figure below we have a wire loop with resistance R. in the gray area, magnetic field is constant and equal to B Figure1 We assumed that wire loop in the figure below has a resistance R so the current generated is : I=vBh/R But what if R=0 (perfectly conductive material) What happens when we move the loop with speed v?
- 1. What is Lenz's Law? To which basic principle of physics it is most closely related and why? 2. Explain how Lenz's Law allows one to determine the direction of an induced current. 3. A straight conducting wire is dropped horizontally from a certain height with its length along east-west direction. Will an emf be induced in it? Justify the answer.1. Explain briefly how Lenz’s law is said to follow the Law of conservation of energy (that explains why there has to be an opposing magnetic field) 2. Why do you think, we need to study the processes, principles and laws in electricity production and distribution?A sort of "projectile launcher" is shown in (Figure 1). A large current moves in a closed loop composed of fixed rails, a power supply, and a very light, almost frictionless bar (pale green) touching the rails. A magnetic field is perpendicular to the plane of the circuit. If the bar has a length ℓ = 30 cm , a mass of 1.5 g , and is placed in a field of 1.5 T , what constant current flow is needed to accelerate the bar from rest to 20 m/s in a distance of 1.5 m ? What is the direction?
- 1.A bar magnet is held vertically with its upper end a little bit below the center of a horizontal metal ring. The upper end of the magnet is its north pole, as shown in the figure. The bar magnet is now dropped. An observer views the ring from above its center. To this observer as the magnet falls, (a) is the current clockwise or counterclockwise? (b) is the current decreasing or increasing? Explain in detail using Lenz’s law. (the 1st image) 2. A spacecraft orbiting the Earth has a coil of wire in it. An astronaut measures a small current in the coil, although there is no battery connected to it and there are no magnets on the spacecraft. What is causing the current? 3. After the switch is closed in the LC circuit shown in the figure below, the charge on the capacitor is sometimes zero, but at such instants the current in the circuit is not zero. How is this behavior possible?(the 2nd image)This week's lab demonstrated some of the essential aspects of magnetic induction. Based on your understanding of how a changing magnetic flux can induce an electric current, describe how a spinning turbine generates electricity when driven by wind, water, or steam.1. What will happen to the voltage if there are more turns on the primary coil than the secondary coil? 2. What will happen to the voltage if there are less turns on the primary coil than the secondary coil? 3. What is the difference between step-up transformer and step-down transformer? 4. What is the common use/application of step-up transformer and the step-down transformer in our daily life?