What is the average induced emf in the loop

That is, the induced current tends to maintain the original flux through the circuit. A wire loop of radius 0. The field changes to The plus and minus signs here refer to opposite directions through the loop. Find the magnitude of the average induced emf in the loop during this time.

The flexible loop in Figure P The loop is grasped at points A and B and stretched until it closes. If it takes 0. This is a case where the change in flux is caused by a change in the area of the loop. Both the magnetic field and the angle q remain constant. When the loop is stretched so that its area is zero, the flux through the loop is zero. An interesting application of Faraday's law is to produce an emf via motion of the conductor.

As a simple example, let's consider a conducting bar moving perpendicular to a uniform magnetic field with constant velocity v. Ask Question. Asked 1 month ago. Active 1 month ago.

Viewed 23 times. Improve this question. Harshvardhan Harshvardhan 1. Add a comment. Active Oldest Votes. Improve this answer. Sign up or log in Sign up using Google. While this is an easily measured voltage, it is certainly not large enough for most practical applications. More loops in the coil, a stronger magnet, and faster movement make induction the practical source of voltages that it is. If emf is induced in a coil, N is its number of turns.

Conceptual Questions A person who works with large magnets sometimes places her head inside a strong field. She reports feeling dizzy as she quickly turns her head. How might this be associated with induction? A particle accelerator sends high-velocity charged particles down an evacuated pipe. Explain how a coil of wire wrapped around the pipe could detect the passage of individual particles. Sketch a graph of the voltage output of the coil as a single particle passes through it.

Referring to Figure 5 a , what is the direction of the current induced in coil 2: a If the current in coil 1 increases? Figure 5. Referring to Figure 5 b , what is the direction of the current induced in the coil: a If the current in the wire increases? Referring to Figure 6, what are the directions of the currents in coils 1, 2, and 3 assume that the coils are lying in the plane of the circuit : a When the switch is first closed? Suppose a turn coil lies in the plane of the page in a uniform magnetic field that is directed into the page.

The coil originally has an area of 0. It is stretched to have no area in 0. What is the direction and magnitude of the induced emf if the uniform magnetic field has a strength of 1. Find the average emf induced in his wedding ring, given its diameter is 2. Integrated Concepts Referring to the situation in the previous problem: a What current is induced in the ring if its resistance is0.

An emf is induced by rotating a turn, Find the magnetic field strength needed to induce an average emf of 10, V. Integrated Concepts Approximately how does the emf induced in the loop in Figure 5 b depend on the distance of the center of the loop from the wire?

Integrated Concepts a A lightning bolt produces a rapidly varying magnetic field. If the bolt strikes the earth vertically and acts like a current in a long straight wire, it will induce a voltage in a loop aligned like that in Figure 5 b.

What voltage is induced in a 1. The heat transferred will be 2. This is not a significant amount of heat. Skip to main content. Search for:. Determine the direction of the magnetic field B. Determine whether the flux is increasing or decreasing. Now determine the direction of the induced magnetic field B. It opposes the change in flux by adding or subtracting from the original field.