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Electricity and Magnetism

Electricity and magnetism are ultimately inextricably linked. Electricity is the term given to a group of physical phenomena involving electric charges, their motions, and their effects. Magnetism is the force generated by the passage of an electric current through matter.

3,116 Questions

What is the difference between vector and algebraic sums?

Well, honey, a vector sum takes into account both the magnitude and direction of the quantities being added, while an algebraic sum just adds up the numbers without caring about which way they're pointing. It's like comparing a GPS giving you directions to a toddler stacking blocks - one's got a sense of purpose, the other's just a hot mess. So, if you want to get somewhere specific, stick with vectors; but if you're just looking to crunch numbers, algebraic sums will do the trick.

A strong electric field exists in the vinicity of the faraday cage why the person inside the cage is not affected?

A Faraday cage is designed to block external electric fields by redistributing the charges within the cage to cancel out the external field. This redistribution of charges creates an equal and opposite electric field inside the cage, effectively neutralizing the external field. As a result, the person inside the Faraday cage is not affected by the strong electric field outside because the cage acts as a shield, preventing the electric field from penetrating the interior.

Why do electric irons have a plastic handle?

Electric irons are made of iron, and since iron is a good conductor of electricity, if you touch it with your bare hands you would get shocked. Plastic doesn't conduct electricity and is one of the best insulators, so it would be safe to use plastic handles while ironing. Even if the ironing machine isn't electric, the machine is bound to get heated, and if you touch it to use it, you would burn your hand, so no matter the type of ironing machines, you always need a plastic handle.

What is the magnetic permeability of nylon?

Well, nylon is a special material that isn't typically known for its magnetic properties. It's like a happy little cloud floating in the sky, bringing softness and comfort. So, while nylon may not have a significant magnetic permeability, it sure does have a way of making us feel cozy and content.

Is combing hair a physical change?

Oh, dude, combing your hair is totally a physical change! I mean, you're literally rearranging the strands of your hair with a comb, so yeah, it's not like your hair magically grows longer or changes color just because you ran a comb through it. It's like giving your hair a little makeover without any magical potions or spells, just good ol' combing action.

List of good and bad conductor of electricity?

Good conductors of electricity include metals such as copper, silver, and aluminum. These materials have a high density of free electrons that can move easily, allowing for efficient flow of electrical current. On the other hand, bad conductors include materials like rubber, glass, and wood, which have few free electrons and high resistance to the flow of electricity.

Are there any ways in which the central heating system model does not represent an electric circuit?

Because a central heating model does not have any electrons travelling through wires but have water. If a wire broke in a electric circuit , then if you're not going to turn off the circuit you would get electrecuted. In a central heating system, if it would break water will leak and nothing will hurt you or anything and you won't get electrecuted.

How many Electrons in a Watt?

Oh honey, let's get one thing straight - a watt is a unit of power, not a physical object like an electron. So, there are zero electrons in a watt. It's like asking how many apples are in a mile - they just don't mix, darling.

What attracts plastic?

Plastic is attracted to certain materials due to electrostatic forces. For example, plastics like polyethylene and polypropylene are attracted to materials with opposite charges, such as certain metals or other plastics with different charge distributions. This attraction is known as triboelectric charging, where materials gain or lose electrons through friction, leading to an electrostatic attraction between the materials.

What is the golden rule of electrostatics?

The golden rule of electrostatics is simple: opposites attract and likes repel. So, if you've got positive and negative charges hanging out, they'll be all over each other like magnets. But if you've got a bunch of positive charges or negative charges trying to get cozy, they'll be pushing each other away faster than you can say "static electricity."

What fluid comes out of a stator plate?

A stator plate would typically release transmission fluid in the event of a leak. This fluid is used for cooling and lubricating the transmission components in a vehicle or machinery. If you notice fluid coming from the stator plate, it may indicate a problem with the transmission system.

Why tube light glowing white colour?

Tube lights glow white because they contain a phosphor coating on the inside of the glass tube that absorbs the ultraviolet light produced by the electric discharge and re-emits it as white light. The combination of different phosphors creates a balanced white light output.

Are there diagonal resistors in an electric circuit?

Diagonal resistors are not a standard component in electric circuits. Resistors are typically placed in series or parallel configurations for specific purposes in a circuit. However, in more complex circuit designs, resistors can be oriented diagonally to optimize space or layout constraints.

What is the base unit for an electrical current?

The base unit for electrical current is the ampere, which is represented by the symbol "A." It is defined as the flow of electric charge per unit time and is a fundamental unit in the International System of Units (SI).

Can one 1500 watt amp power one 15 kicker and two 12s?

Yes, a 1500-watt amp can power one 15" subwoofer and two 12" subwoofers simultaneously. However, it's important to ensure that the impedance of the subwoofers matches the amp's capabilities to prevent damage and achieve optimal performance. Additionally, setting the gain and other audio settings correctly will help balance the sound output from each subwoofer.

Can you connect 240 3 ph motor to 480 3 ph by dropping a leg?

No, you cannot connect a 240V 3-phase motor to a 480V supply by dropping a leg. The motor is designed to operate at a specific voltage, and changing the voltage in that manner can damage the motor and pose a safety hazard. It is recommended to use a transformer to step down the voltage to match the motor's rating.

Why more energy is released in fusion than fission?

In fusion, lighter nuclei combine to form a heavier nucleus, releasing energy due to the conversion of mass into energy as per Einstein's equation, E=mc^2. This process releases more energy than fission, where heavier nuclei are split into lighter fragments. Fusion reactions involve the release of greater energy because they involve bringing positively charged nuclei close enough for the strong nuclear force to overcome their electrostatic repulsion.

Is resistivity of conductor independent of charge?

Yes, resistivity, which is a material property, is independent of the amount of charge. Resistivity is determined by the material itself, while the amount of charge only affects the flow of current through the conductor.

How do you calculate the power need to carry a particular mass by magnetic levitation?

The power needed to levitate a particular mass using magnetic levitation depends on the strength of the magnetic field, the distance between the magnets and the object, and the speed at which the object is moving. This can be calculated using the formula: Power = Force x Velocity. The force exerted by the magnetic field and the velocity at which the mass is being carried are key factors to consider in this calculation.

What is the electrical load of a cinema?

The electrical load of a cinema can vary depending on the size of the theater, the number of screens, the equipment used, and the lighting systems. On average, a cinema's electrical load can range from 200-600 kilowatts per screen.

What is the difference between daily energy requirement and basal energy requirement?

Basal energy requirement refers to the amount of energy needed to maintain basic physiological functions at rest, while daily energy requirement includes the additional energy needed for physical activity and other daily tasks. Basal energy requirement makes up the majority of daily energy expenditure, with physical activity level influencing the total daily energy requirement.

What are radio waves primarily used for?

Radio waves are primarily used for telecommunications, including broadcasting radio and television signals, as well as communication between devices such as mobile phones, walkie-talkies, and wireless internet. They are also used in radar systems for tracking objects and in medical imaging technologies like MRI.

Why increase the amperige in the electrical circuit of a tractor?

Increasing the amperage in the electrical circuit of a tractor can provide more power for accessories or implements that require higher current to operate efficiently. It helps prevent overheating and voltage drops, ensuring that all electrical components work properly under heavier loads.