Question

(a) Have you ever visited an amusement park and taken a ride on a parachute drop ride? These types of rides take the passengers to a great height, and then drop them in free fall. Before they hit the ground, the ride is slowed using a Lenz’s law mechanism thus avoiding certain death. For this discussion, first locate a photo of one of these rides (either one you’ve personally experienced or one you might like to try someday), and in your initial post, upload the photo and respond to the following:

• Explain how Lenz’s law applies to this situation.
• Why is the Lenz’s law mechanism ideal for such a use?
• What other mechanisms can be used to slow the descent? Compare and contrast these options with the Lenz’s law mechanism.

(b) As you have learned, an electromagnet is a magnet that is produced by electric current. Think about how electromagnets are used and what you have seen or heard of them being used for. In your initial discussion post, respond to the following:

• Which of the principles or laws discussed in this module explain how an electromagnet works?
• Describe in detail two modern applications of electromagnets. Do these electromagnets draw a large amount of current or a little? How do you know? What supplies that current?
• Why do you think electromagnets are used in these different ways?
• What is the advantage of using an electromagnet rather than a permanent magnet?

Answer 1

a)according to Lenz's law, the direction of induced electric current is always such that, it opposes the change in magnetic flux.

-Now, the case we refer is a drop ride, in this the hub on which we sit and are hung to is an electromagnet and there are many such magnets mounted on the columns of the support. what happens is these electromagnets (in support) generate a repulsive magnetic field with respect to the field generated by the hub solenoids. this results in lift generation till the top of ride. reaching the top, the bar solenoids are at their maximum repulsive force. Then the solenoids in column are set current less means electric supply is cut off. this makes you fall under the effect of gravity. by the time you are half way down, column  solenoids are turned on again. NOW AS THE HUB SOLENOID APPROACHES EVERY SINGLE ELECTROMAGNET IN SUPPORTING COLUMNS. DUE TO CHANGE IN MAGNETIC FEILD(as per lenz's law) AN OPPOSING CURRENT INDUCES FURTHER PROVIDING RESISTANCE TO THE FALL . this continues until the ride comes to rest completely. This is how it works.

-here, as we need a resistance to stop the falling object without any jerk and in an awesome enjoyable manner, we need a braking type, magnitude of which depends upon the speed of fall and time it takes to stop. with the help of Lenz's law we can feasibly achieve this. at the start of braking magnitude of resistance is highest and with time magnitude approaches to zero(as ride stops). This mechanism also requires less space and is simple in design and can be relied upon for safety.

-highly compressive springs, dampers, viscous dampers, etc. could be used in its place.

but the above listed cannot provide a differential braking,

have a limited lifecycle,

will provide resistance during lift also,

require higher maintenance;

b)

-please provide complete information;

- MAGLAV also known as magnetic levitation used in bullet train track's construction;

second is electromagnetic dampers for dampening the vibrations, they act as isolators;

- please provide the complete information of the comprehension of which these questions are generated;

- the biggest advantage is that in permanent magnets poles remain fixed, while in electromagnets the poles can be switched using the change in electric field direction,

electromagnets depend on electric supply whereas permanent magnet strength depend upon material,

permanent magnet field starts to deteriorate, whereas the electromagnet's field remains the same till the current dies out.

I hope you find your desired answer in this solution,

thanks