# Is magnetic field is produced by uniformly moving charge?

1. Mar 3, 2010

### waqarrashid33

Is magnetic field is produced by uniformly moving charge?is it affect it,s magnetic field?
Is Magnetic field of charge is due to relative motion?

2. Mar 3, 2010

### tiny-tim

Hi waqarrashid33!

A stationary charge, as you know, has no magnetic field.

In any other frame, it does have a magnetic field (and its electric field also changes), in accordance with the Lorentz trannsformation.

In other words, a charge moving relative to the observer (even uniformly moving) has a magnetic field.

3. Mar 3, 2010

### waqarrashid33

Let suppose a man have charge in his hand and runing the he will not feel the magnetic field field of charge by a compass and a man standing near to him will detect the magnetic field by his compass?

4. Mar 3, 2010

### tiny-tim

That's right!

5. Mar 3, 2010

### Born2bwire

If the charge is at rest, then any observer in the same frame will not see a magnetic field. Only those that see a moving charge have a chance to see magnetic field produced by this charge.

6. Mar 4, 2010

### blitz.km

even if the moving charge is accelerating??

7. Mar 4, 2010

### espen180

As long as it's moving, it has a magnetic field. The instances, if any, in which v = 0, this is not the case. As you may be aware of, the field strength og the magnetic field is linearily proportional to the speed.

8. Mar 7, 2010

### waqarrashid33

THE production of magnetic affect the E.field of the charge?

9. Mar 7, 2010

### tiny-tim

The magnetic field and the electric field are both affected by the same thing: the motion of the charge.

The magnetic field and the electric field do not affect each other.