A point charge moves past an observation point at constant speed
PHYSICS · Single correct · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism
Problem
A point charge moves past an observation point at constant speed. When the angle between its velocity vector and the line connecting the charge to the observation point is 90∘, the magnetic field magnitude there is B0. Later, the angle becomes 60∘ while the speed and distance remain unchanged. Which of the following best describes the new field magnitude B compared with B0?
(a) B is about 1.15B0.
(b) B is about 0.75B0.
(c) B is about 0.87B0.
(d) B is the same as B0.