Dean is hunting in the northwest territories at a location where earths magnetic field is 7.0x10^-5t. he shoots by mistake at a duck decoy, and the rubber bullet he is using acquires a charge of 2.0x10^-12c as it leaves his gun at 300 m/s, perpendicular to earths magnetic field. what is the magnitude of the magnetic force acting on the bullet?

The magnetic force acting on an object of charge q is

where
q is the charge
v is the speed of the object
B is the magnetic field intensity
is the angle between the directions of v and B.

In our problem, the direction of the bullet is perpendicular to the magnetic field, so  and , so we can ignore it in the formula.

Therefore, we can use the data of the problem to calculate the magnetic force on the bullet:

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