An electric charge in uniform motion produces:
Correct answer: C. Both magnetic and electric fields.
- A. An electric field.
- B. A magnetic field.
- C. Both magnetic and electric fields.
- D. Neither magnetic nor electric fields.
Explanation
An electric charge produces an electric field around it, and when the electric charge is in motion it causes a change in position of the electric field. This changing electric field allows the production of a changing magnetic field .Therefore there will be both magnetic and electric fields present. However, if the electric charge was stationary there would be no change in the electric field hence no change in the magnetic field.Electric charge needs to be in motion to allow production of both electric and magnetic fields.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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About Electric Field
An electric field is the force experienced per unit positive test charge, with the field of a point charge given by E = kQ/r² and directed away from positive charges or toward negative charges. Questions involve field lines, superposition and force on a charge, while electric field must be distinguished from electric potential.
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