The magnetic field is generated by:
A) an electron moving at constant speed in a straight line
B) a proton moving in a circle
C)a neutron moving in a circle
D) none
A and B are correct. Cannot you read Amperes Law, or Ampere's discovery? Moving charges (currents) generate magnetic fields. You need not post this again. Read for yourself: http://en.wikipedia.org/wiki/Magnetic_field
I Know, I did read it...But i am not provided with an answer choice of both. I am wondering, must the electron be moving in a straight line?
The correct answer is B) a proton moving in a circle.
To understand why, let's delve into the concept of magnetic fields. Magnetic fields are created by moving charged particles. When a charged particle moves, it generates a magnetic field around itself.
In the case of an electron moving at constant speed in a straight line (option A), it does create an electric field, but it does not generate a magnetic field. The magnetic field is only generated when the charged particle is in motion.
On the other hand, a proton moving in a circle (option B) does generate a magnetic field. When a charged particle moves in a circular path, it experiences a change in velocity, and as a result, it experiences acceleration. This acceleration of the proton causes it to create a magnetic field perpendicular to the plane of its circular motion.
For option C, a neutron is an electrically neutral particle, meaning it has no charge. Since it does not have any charge, it cannot create an electric or magnetic field.
Therefore, the correct answer is B) a proton moving in a circle, as it generates a magnetic field.