Explain what is a pseudo force? Include an example. What do you understand by the e.m.f. of a cell? Explain polyphase current? How can you explain work, in regards to electricity? A person who works with large magnets sometimes places her head inside a strong field. She reports feeling...
Two pairs of electromagnet coils, shown here in red and blue, are energized in turn by an AC supply (not shown, but coming in to the leads on the right). The two red coils are wired in series and energized together and the two blue coils are wired the same way. Since it's AC, ...
Explain why a soft-iron core increases the strength of an electromagnet. Explain how and why the ferromagnetic domains formed. Draw a typical B-H loop and describe the different magnetization processes that lead to the formation of the...
Unlike in the motorcycle brake, there is no contact at all between the electromagnet and the brake disc: there's an air gap of a few millimeters between them. Photo by Take-y courtesy of Wikimedia Commons published under a Creative Commons Licence. How do these things work in practice?
Right: If you took off the casing, this is the kind of thing you'd see. It's a simple brushless motor from a PC cooling fan, but it works in broadly the same way as a bike's hub motor. There's a static part made up of four electromagnet coils (left) and a rotating part (...
Explain why a soft-iron core increases the strength of an electromagnet. Explain, how would you protect yourself from Alpha radiation. An iron nail becomes hot when it is hammered, Why? Describe the specifics of metals' band structure. ...
Lifting device: It could be a simple hook, a clamshell bucket, an electromagnet, a grabbing claw, or a pronged attachment called a spreader for lifting standard-sized shipping containers at their corners.Counterweight: Most cranes have one or more heavy (often concrete) blocks mounted opposite ...
Explain how does the rotation of the Earth makes a body weigh more at the poles than at the equator. Weight at the Surface of the Earth The gravitational force at the surface of the Earth is equal to the weight. This force pulls us down to the surfa...
Coil: This becomes an electromagnet whenelectricityflows through it. Transparent plastic cone: This makes the sound when it moves. Sponsored links How bigger headphones work As you might expect there's nothing radically different inside bigger headphones: they're just a scaled-up version of what ...
This photo shows very nicely how a record player works. Turn on the machine and an electric motor (not shown) makes the black vinyl disc rotate around the silver peg in the center. You lower the tonearm (a pivoted lever with the stylus and cartridge on the end) onto the outer edge of...