Physics, 27.08.2019 10:00 dakshshberry

Explain what it mean to say that energy is conserved

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It really means that the total amount of energy in the universe is
a fixed number, and doesn't change.

So if you're watching what's going on in some fixed bottle, box, pot,
or other volume, 'conservation' means that no energy can magically
appear in the bottle or disappear from it. The total amount of energy
can't change. The energy can only move from one place to another.
So if you see the amount of energy change inside there, then you
know that either some of the original energy must have leaked out
and escaped, or else more energy came in from somewhere.

This is actually a very powerful thing to know. It helps solve a lot
of problems.

Answer from: Quest

a small object of mass 3.66 g and charge -17.6 µc is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. what are the magnitude and direction of the electric field?

Answer from: Quest

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

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