A point charge is moving with speed 2 107 m/s along the x axis.At t = 0,the charge is at x = 0 m and the magnitude of the magnetic field at x = 4 m is B0.The magnitude of the magnetic field at x = 4m when t = 0.1 s is
A) B0/2
B) B0
C) B0/4
D) 2B0
E) 4B0
Correct Answer:
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