Question: Consider an annular region in free space containing a uniform magnetic field in the z -direction, schematically represented by the shaded region in the

Consider an annular region in free space containing a uniform magnetic field

Consider an annular region in free space containing a uniform magnetic field in the z -direction, schematically represented by the shaded region in the figure. A particle having charge Q and mass M starts off from point P(a,0,0) in the +x- direction with constant speed v. If the radii of inner and outer circles are a and b, respectively, the minimum magnetic field required so that the particle returns to the inner circle is (a) (c) 2 Mv(b. a b Mv(b-a 3b Q 2 (b) Mv(b Q 2b (d) - a 2 Mvb-a M (1 Q 46 2 -1 O. P X

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