The answer is definitely C.) their molecules move at the same average speed
I would say its c . <span>National Academy of Forensic Science</span>
Answer:
Electric Field a the centre
Explanation:
<u>Given:</u>
Total charge on the semicircle =Q
Radius of the semicircle=R
Let consider a elemental charge on the semicircle at an angle 
with the horizontal. Since the The charge distribution is symmetrical about y axis so the there will symmetrical charge on other side. The horizontal component will cancel out each other and vertical component will get added so let dE be the electric Field due to elemental charge
Let 
be the charge per unit length such that
Total Electric Field at the centre
integrating 0 to 
So the Electric field at the centre is calculated.
'Traveling around a circular track' can be a description of constant
acceleration due only to changes in direction. But if it is, then the
progress around the circular track must be at constant speed.
