Review Conceptual Example 2 as background for this problem. A charged particle moves through a velocity selector at a constant speed in a straight line. The electric field of the velocity selector is 3240 N/C, while the magnetic field is 0.474 T. When the electric field is turned off, the charged particle travels on a circular path whose radius is 6.01 cm. Find the charge-to-mass ratio of the particle.

An electromagnetic rail gun can fire a projectile using a magnetic field and an electric current. Consider two conducting rails that are 0.700 m apart with a 50.7-g conducting rod connecting the two rails as in the given figure. A magnetic field of magnitude 0.760 T is directed perpendicular to the plane of the rails and rod. A current of 2.00 A passes through the rod. What direction is the force on the rod? If there is no friction between the rails and the rod, how fast is the rod moving after it has traveled 8.00 m down the rails?

An electron moves at a speed of 660 m/s perpendicular to the direction of a uniform magnetic field of 0.1 T. What is the radius of the electron's circular orbit in units of nanometers (1 m = 109 nm)? %3D (in units of nanometers)

can you please ans (a) (b) (c)?