At a particular instant a proton is travelling in the -z direction with a speed

Question

At a particular instant a proton is travelling in the -z direction with a speed of 7 times 10^5 (m/s). At the location of the proton there is a magnetic field of magnitude 0.27 [T] in the +z direction to a current running in a nearly coil. What is the magnitude of the magnetic force on the electron and what is the direction of the force? F_mag = 0[T], direction = zero magnitude F_mag = 6.49 times 10^-12 [N], -x direction F_mag = 2.43 times 10^-13 [N], +x direction F_mag = 7.59 times 10^-13 [N], +y direction

Explanation / Answer

magnetic force on a travelling charge = q*v*B*sin(x) where x is angle between v and B

here we can see that the angle is 180o

so the force will be zero

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