Electromagnets are used in all kinds of electric devices, including hard disk drives, speakers, motors, and generators, as well as in scrap yards to pick up heavy scrap metal. They're even used in MRI machines, which utilize magnets to take photos of your insides!
Answer:
the ratio of the force produced by a machine to the force applied to it, used in assessing the performance of a machine.
Explanation:
Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system. The device preserves the input power and simply trades off forces against movement to obtain a desired amplification in the output force. The model for this is the law of the lever.
Magma forms by partial melting of upper mantle and crust. Partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. The partial melt rises because of its lower density and ascends through he crust.
Answer:True
Explanation:
By applying Gauss law Electric field is zero everywhere inside the conductor.
According to Gauss law the net flux of an electric field in a closed surface is directly proportional to the enclosed electric charge.
For example
For a Gaussian surface inside a conductor all the points have zero electric field as the system is in equilibrium. This implies net flux is zero and net charge inside is zero . So all the charge must be at surface on conductor.