Name ________________________________________________ Period ____________
Magnetic Field Worksheet
On a separate sheet of paper:
- Solve each problem
- Start by writing the formula.
- Rearrange the formula as necessary.
- Once you have the variable you are solving for isolated, then plug in the numbers.
- Do a unit check.
- You will be graded on the neatness of your work as well as your solutions. View the solutions I’ve posted on my website to previous homeworks for a guideline as to how I want to see these problems solved.
1. A proton traveling at a speed of 
passes perpendicular to a uniform magnetic field of 
. What is magnitude of
the force on the proton while the proton is in the magnetic field?
Unit check
2. A uniform 1.5 T magnetic field points
north. If an electron moves vertically
downward (toward the ground) with a speed of 
through this field, what
force (magnitude and direction) will act on it?
The force is to the west. Use the right hand rule. Point your fingers towards the north, and your thumb down. Use the back of your hand since this is an electron. It points west.
3. A proton moves straight upward (away from the
ground) through a uniform magnetic field that points from east to west and
magnitude of 2.5 T. If the proton moves
with a speed of 
through this field, what force (magnitude and direction) will act on
it?
From north to south (use right hand rule, p. 774 Holt)
4. A proton traveling to the right at an angle
of 10 degrees to the x-axis enters a
region where there is a magnetic field of magnitude 2.5 T directed upward along
the y-axis. If the proton experiences a force of 
, find the speed of the proton.
Unit check
5. If an electron in an electron beam experiences
a force of 
down while traveling north at a speed of 
, then what is the magnitude and direction of the magnetic
field that deflects the electron?
To the west (use the right hand rule, p. 774 Holt)
6. An alpha particle (the nucleus of a helium
atom, carrying a charge of 
) moves at 
at a right angle to
the magnetic field. If the particle
experiences a force of 
due to the magnetic field, then what is the magnitude of the
magnetic field?
