« previous next »

Author Question: What is the cause of a magnetic field about a permanent magnet and about a current-carrying wire? ... (Read 22 times)

Kthamas

  • Hero Member
  • *****
  • Posts: 546
on: Jul 29, 2018
What is the cause of a magnetic field about a permanent magnet and about a current-carrying wire?
 
  What will be an ideal response?

Question 2

What correction do you suggest to a friend who states that a step-up transformer boosts energy, while a step-down transformer reduces energy in a circuit?
 
  What will be an ideal response?


meganmoser117

  • Sr. Member
  • ****
  • Posts: 303
Reply #1 on: Jul 29, 2018
Answer to Question 1

Answer: All magnetic fields have their origin in the motion of electric charges. About a permanent magnet the moving charges are electron motions, including possibly spin motions, in the atoms that compose the magnetmost commonly iron atoms. About a current-carrying wire, the drifting electrons produce the magnetic field.

Answer to Question 2

Answer: Mainly, remind your friend of the conservation of energy. Although a transformer can step up or step down voltages and currents, in no way can it do the same with energy. Energy can neither be created nor destroyed.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.

Did you know?

When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

Did you know?

Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.

Did you know?

Though newer “smart” infusion pumps are increasingly becoming more sophisticated, they cannot prevent all programming and administration errors. Health care professionals that use smart infusion pumps must still practice the rights of medication administration and have other professionals double-check all high-risk infusions.

Did you know?

Signs and symptoms that may signify an eye tumor include general blurred vision, bulging eye(s), double vision, a sensation of a foreign body in the eye(s), iris defects, limited ability to move the eyelid(s), limited ability to move the eye(s), pain or discomfort in or around the eyes or eyelids, red or pink eyes, white or cloud spots on the eye(s), colored spots on the eyelid(s), swelling around the eyes, swollen eyelid(s), and general vision loss.

Taken by Hinode's Solar Optical Telescope on January 12, 2007, this image of the Sun reveals th Taken by Hinode's Solar Optical Telescope on January 12, 2007, this image of the Sun reveals th
Babcock’s Magnetic Dynamo Babcock’s Magnetic Dynamo
Joseph Moore and His Family (1839), by Erastus Salisbury Field, reflects the emerging middle-class f Joseph Moore and His Family (1839), by Erastus Salisbury Field, reflects the emerging middle-class f
Jean Piaget influenced the field of developmental science more than any other individual. Jean Piaget influenced the field of developmental science more than any other individual.
What is the contribution of studying wing spot in the field? What is the contribution of studying wing spot in the field?
Field Triage Decision Scheme Field Triage Decision Scheme
Video: Magnetic resonance imaging (MRI)

For a complete list of videos, visit our video library