Why is electric magnet a temporary magnet

The electric magnet (Electromagnetic) is temporary because you can turn it on and off.  When it's power source is gone, the magnet becomes useless.  Usually it's power source is a battery, but it could be solar with a switch.  Hope this helps.  Please give me brainliest is this helps you.

The potential Energy of the spring = 0.577 J.

Explanation:

Potential Energy of a spring: This is the energy stored in a spring when it is stretched or compressed. The S.I unit of potential Energy is (J).

Mathematically, the energy stored in a spring is given as,

E = 1/2ke² Equation 1.

Where E = potential Energy, k = spring constant, e = extension.

Given: k = 559.9 N/m, e = 4.54 cm = 4.54/100 = 0.0454 m.

Substituting into equation 1

E = 1/2(559.9)(0.0454)²

E = 0.577 J.

Thus The potential Energy of the spring = 0.577 J.