How do prices help determine for whom goods will be produced in a market economy

What are the choices

Answer: Burning of fossil fuels.

Explanation:

Every magnet has two unlike poles.

The neutral region within a magnet lies between the north and south poles.

If the north pole of a bar magnet is brought near the north pole of another magnet, the two magnets will repel one another.

A material that's attracted by a magnet but doesn't necessarily become a magnet itself is called a ferromagnetic material.

What is magnet?

A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, cobalt, etc. and attracts or repels other magnets.

What are properties of magnet?

1. Magnet will attract ferromagnetic substances.
2. Like poles of the magnet repel each other and unlike poles attract each other.
3. A suspended magnet always comes to rest in the north-south direction.
4. The poles of the magnet are in pairs.

What is Ferromagnetic materials?

Ferromagnetic materials are those materials which exhibit a spontaneous net magnetization at the atomic level, even in the absence of an external magnetic field. When placed in an external magnetic field, ferromagnetic materials are strongly magnetized in the direction of the field.

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Answer:

Four metals other than iron that can be made to exhibit magnetic properties are nickel, cobalt, manganese, and chromium.

two

neutral region

north

magnetic

Explanation:

Answer:

Explanation:

Ohm's Law is V = IR    Voltage = Current x Resistance

Therefore, I = V/R

Part 1:  The longer the wire, the greater the resistance.  Therefore, to keep the current, I, at a steady 10 mA, you need to increase the voltage if you're going to lengthen the wire.  Increase the battery voltage by using a higher voltage battery, or connect more batteries in series until you have sufficient voltage.

Part 2:  For the toaster, you need the resistance in the wires to be high in order for the wires to glow and get hot.  Toasting wires need to be made from a material with high resistance and to coil or loop them to increase the length.  Also, the thinner the wire, the higher the resistance.  In summary, choose a wire material that has a high resistance and use thin wire that is coiled or looped.  Of course, you have to make sure that the "toasting wires" don't get so hot that they catch fire.

Answer:

Explanation:

I'd be happy to help you with the questions related to Ohm's Law and circuit design:

Ways to Change Resistance in a Circuit:

Resistance in a circuit can be changed by adjusting the following factors:

Length of the Conductor: Increasing the length of a wire increases its resistance.

Cross-Sectional Area: Reducing the cross-sectional area of the conductor increases resistance.

Material: Different materials have different resistivity. Choosing a material with higher resistivity increases resistance.

Temperature: Resistance of most conductors increases with temperature.

Maintaining a Steady Current with Increased Wire Length:

If you need to maintain a steady current of 10 milliamperes while greatly increasing the length of the wire between the battery pack and the appliance, you should reduce the resistance in the circuit. To do this:

Use a wire with a larger cross-sectional area (lower resistance).

Select a material with lower resistivity.

Increase the voltage from the battery pack, keeping in mind the power requirements of the device, to compensate for the increased resistance due to the longer wire.

Designing a Toaster with Low Voltage:

To design a toaster that operates at a lower voltage while using hot, glowing wires, you can consider the following characteristics for the "toasting" wires:

High Resistivity Material: Use a material with high resistivity, which will heat up quickly with less voltage applied. Nichrome wire is commonly used for this purpose.

Long and Thin Wires: Long and thin wires will have higher resistance and heat up more with less voltage. Ensure the wires are designed for the required power.

Temperature Control: Implement a temperature control system to maintain the wires at the desired temperature range for toasting while minimizing power consumption.

Insulation: Proper insulation should be used to ensure safety and prevent electrical hazards.

Safety Mechanisms: Incorporate safety features to prevent overheating and potential fire hazards, as the wires will operate at high temperatures.

Keep in mind that safety is a crucial consideration when working with high-temperature wires, and it's essential to follow relevant electrical and safety standards when designing such devices.

Answer: c) mixture.

Explanation:

An atom is the smallest entity of any substance which consists of subatomic particles called as neutrons, protons and electrons.

An element is a pure substance which is  composed of atoms of similar elements. Example:  

Mixture is  formed when atoms of similar or different elements are mixed in no fixed ratio without any chemical combination.

A compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.  Example: