First slide

Force on a charged particle moving in a magnetic field

Question

A particle is projected in a gravity force space where a uniform magnetic field exists. if the trajectory of the particle is a straight line, then the particle

Moderate

A

may be an electron
B

may be a proton
C

may be a neutron
D

all of the above are correct

Solution

If a neutron is projected in any direction in magnetic field, its path will be a straight line as me magnetic force acts on it. If a charge particle is projected in a uniform magnetic field in a direction parallel to the field, then magnetic force $(\vec{F_{B}} = q \vec{V} \times \vec{B})$ acting on the particle will be zero and the trajectory of the particle will be straight line. hence option (4) is correct.

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