Consider the moving electron in problem E9T. 9 above. Point $a$ is a distance $R$ from the electron, but point $b$ is only $(1 / 2)^{1 / 4} R \approx 0.84 R$ from the electron. At which point is the magnitude of the magnetic field the largest?

A. Point a
B. Point $b$
C. The field has the same magnitude at both points.

Question

Consider the moving electron in problem E9T. 9 above. Point $a$ is a distance $R$ from the electron, but point $b$ is only $(1 / 2)^{1 / 4} R \approx 0.84 R$ from the electron. At which point is the magnitude of the magnetic field the largest?
  
A. Point a
B. Point $b$
C. The field has the same magnitude at both points.

Consider the Moving Electron in Problem E9T aaa Is a Distance RRR

Consider the Moving Electron in Problem E9T $a$ Is a Distance $R$