Question

If a charged particle moves through a magnetic field, then effect of the field is to change the particle's

• A. speed
• B. energy
• C. acceleration
• D. direction of motion

Answer 1

Answer: (D)

direction of motion

Magnetic force on a moving charge placed in a magnetic field is given by,
$F=q\left(VXB\right)$
we can see from the equation that magnetic force is cross product of magnetic field strength and velocity ,hence the direction of force will be perpendicular to both of them.
And it will try to change the direction of motion.