Home » Posts tagged 'magnetic field lines'

Tag Archives: magnetic field lines

What are the similarities and differences in magnetic and electric field?

Similarities and differences in magnetic and electric field (Dilpreet posted this question)

Similarities Differences
 Both electric and magnetic field are conservative forcesBoth obey inverse square law

Both are non contact forces (Forces can be exerted without contact)

Both are attractive as well as repulsive (Like poles repel, like charges repel; unlike poles attract, unlike charges attract)

 Electric field is produced by a charge whether at rest or in motionBut magnetic field is produced only by a moving charge

 

The total magnetic flux through any closed surface is always zero, but the total electric flux through any closed surface is equal to the net charge enclosed by the surface multiplied by the reciprocal of absolute permitivity

Electric field lines are discontinuous as they have a starting point (+ charge) and an ending point (- charge); But magnetic field lines are continuous, they always form closed loops

 

Devices using permanent magnets and electromagnets

Galvin Pinto asked;

  1. List the devices where permanent magnets & electromagnets are used.
  2. Sketch the pattern of the field lines around a current carrying:
    • Straight Conductor

    • Loop of wire

    • Solenoid

    Ans:

    1. Permanent Magnets are used in
      • Laboratory magnets
      • loud speakers
      • microphones
      • cyclotron
      • generators
      • and many more
    2. Pattern of the field lines around a current carrying

    Straight Conductor

    image

    Loop of wire

    image

    Solenoid

    image

    Hits so far @ AskPhysics

    • 2,265,941 hits

    Subscribe to AskPhysics via Email

    Enter your email address to subscribe to this blog and receive notifications of new posts by email.

    Join 4,340 other subscribers

    February 2021
    M T W T F S S
    1234567
    891011121314
    15161718192021
    22232425262728

    Schrodinger’s Cat in Daily Life

    %d bloggers like this: