24. An electron moves through a uniform magnetic field given by . At a particular instant, the electron has velocity m/s and the magnetic force acting on it is (6.4×10-19 N) . Find Bx. (A) -1.6×10-19 T (B) -3.2×10-19 T (C) -0.22T (D) -1.0T (E) -2.0T

21. The figure shows a rigid structure consisting of a circular hoop of radius R and mass m, and a square made of four thin bars, each of length R and mass m. The rigid structure rotates at a constant speed about a vertical axis, with a period of rotation of 2.5 s. Assuming R=0.5 m and m=2.0 kg, calculate the structure’s rotational inertial about the axis of rotation. (A) (B) (C) (D) (E)

24. An electron moves through a uniform magnetic field given by . At a particular instant, the electron has velocity m/s and the magnetic force acting on it is (6.4×10^-19 N) . Find Bx.
(A) -1.6×10^-19 T
(B) -3.2×10^-19 T
(C) -0.22T
(D) -1.0T
(E) -2.0T

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