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Magnetic field due to current

Right hand rule is a physics principle applied...

 

A spinning electron creates a magnetic field.But what about an electron inside a current carrying wire electron is spinning around its axis and revolving in loop,both simultaneously.So,what if both the situations contradict (both magnetic fields are in opposite direction ).net M.F. should be zero then. I mean what is the fate of electron in a current carrying wire with respect to its spin?

 

Asked Aakanksha

 

Why there is no magnetic field around a disconnected copper wire

Moving electrons produce magnetic field right? Electrons on earth are moving at an average of 27.83m/s due to earths rotation plus 30m/s due to earths revolution and may be more due to sun’s revolution and our galaxy’s revolution.
since there is no absolute motion, how can we tell if electrons are moving?
If the electrons are moving, anyway, why is there no magnetic field around a disconnected copper wire?

Asked  N.Srichakradhar Reddy

Right hand rule is a physics principle applied...
Right hand rule is a physics principle applied to electric current passing through a straight wire, resulting in a magnetic field. The thumb points in the direction of the conventional current (from positive to negative), and the fingers in the direction of the magnetic field. (Photo credit: Wikipedia)

Questions posted via PhysicsFans.com chat

  • In nuclear physics during beta- decay a  proton is converted to neutron,positron and a neutrino. How it’s possible for a proton to decay into more massive neutron. And it’s said that the decay is possible only when it’s inside the nucleus. so whether any other factors is involved in this decay?
  • We study in magnetism that Earth’s magnetism has 3 components namely declination Inclination,Horizontal component of Earth’s magnetic field. What is the cause of declination? Why it changes from place to place?

Why is the force on a wire NOT carrying current is zero when kept in a magnetic field?

Explain zero force acting on a wire  which is not carrying current,on being placed inside a magnetic field.

Asked Praagy Shukla

Answer:

Fleming's left hand rule shows the direction o...

A charge at rest will not experience any force in a magnetic field, but a moving charge will experience  a force unless it is moving parallel to the field.

In a conductor, the electrons are in rapid and random motion, but the conductor will not experience a force until a current is passing through it. (Even though the electrons are not at rest). This is because, in the absence of a current, the motion of electrons is random and there is no net drift of electrons in any direction. Thus the forces cancel out.

When a current is passed through the wire, there is a net drift and hence a net force is experienced by the current carrying conductor in a magnetic field.

Further, I want to mention that the force is experienced between the existing field and the field produced by the moving charges/ current.

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