A 5.30-ìC charge is moving with a speed of 9.30 x 104 m/s parallel to a very long, straight wire. The wire is 6.60 cm from the charge and carries a current of 87.0 A. Find the magnitude of the force on the charge.

Answer 1

The magnetic field at the charge location is
B = mu_o* I/(2*pi*R)

where mu_o is the permeability of free space, 4*pi*10^-7 Weber/(amp*meter)

The force on the charge is
q V B
since V and B are in perpendicular directions