A charged particle enters into a uniform magnetic field and follows a circular path as shown. This happens when the particle enters perpendicular to the magnetic field. It gets deflected by magnetic lorentz force Arrows indicate the direction of motion of the charged particle

If `vecv` the velocity of the particle of charge q and B is the magnetic field, then the force acting on the particle is given by: `vecF = q ( vecv xx vecB).`
If the particle velocity is perpendicular to the magnetic field, then the magnitude of the force is F = quB. This force provides the necessary centripetal force for the particle and the radius of the circular path is given by` : r = ( mv)/(qB),` where m is the mass of the particle.
The direction of deflection also depends on the nature of the charge. If the particle enters the fields at an angle other than `90^(@),` then, the path of the particle will be helical (not circular).
Which of the following particles will not get affected if sent into a magnetic field normal to it?

Options

A. Alpha
B. Positron
C. Neutron
D. Electron

Answer

C

Explanation

Neutral particles are not affected by magnetic field.