Question

Please answer last 3 questions and give explanation

A positively charged parade is at rest on the positive z axis in reference frame S. Reference frame S' is moving along the positive x axis of S, reference frame S" is moving along the negative x axis, and reference frame S''' is moving along the y axis, all with speed v relative to S. The axes of all the reference frames are oriented the same way, and their origins coincide at instant t = 0, when observers in each reference frame make measurements. Compare the magnitudes of the magnetic fields measured in the reference frames S, S', S" and S'''. B' = B" = B''' > B = 0 B' = B" = B''' > B > 0 B > B' = B" = B''' > 0 B > B' = B" = B''' = 0 What is the direction of the magnetic field measured at the origin in the reference frame S'. positive z direction positive y direction positive x direction negative z direction negative x direction negative y direction What is the direction of the magnetic field measured at the origin in the reference frame S:. negative y direction positive z direction negative z direction positive z direction negative z direction positive y direction What is the direction of the magnetic field measured at the origin in the reference frame S'''. positive z direction negative z direction positive y direction negative x direction negative y direction positive x direction

Answer 1

Answer 2

The direction of magnetic field is determined by the direction of current as observed by the observers in different frames of reference. The direction of magnetic field produced the current is given by right hand thumb rule which states that if right hand of the thumb is pointed in the direction of current, then direction of the curl of the fingers gives the direction of the magnetic field at that point due to the current. Part -B If the observer is moving in S frame. Since, he is moving along positive x-axis He will see the electron moving in negative direction of x- axis. Therefore, for him current will flow in positive direction of x-axis Using right hand thumb rule. Direction of magnetic field for the observer is along negative direction ofy-axis Part -C If the observer is moving in S frame. Since, he is moving along negative x-axis He will see the electron moving in positive direction ofx- axis. Therefore, for him current will flow in negative direction of x-axis Using right hand thumb rule. Direction of magnetic field for the observer is along positive direction of y-axis Part -D If the observer is moving in S frame. Since, he is moving along positive y-axis He will see the electron moving in negative direction of y- axis. Therefore, for him current will flow in positive direction of y-axis Using right hand thumb rule. Direction of magnetic field for the observer is along positive direction of x-axis.