Magnetism & Electromagnetism

What is the symbol for magnetic field?

• F

• B

• M

• I

What is the symbol for a charge?

• Q

• B

• F

• C

What units do you measure magnetic fields in?

• B

• T

• N

• C

What units do you measure charge in?

• C

• Q

• T

• N

What unit do you measure L in?

• m/s

• T

• m

• C

What units do you measure I (this is a capital i) in?

• C

• B

• A

• m

A stream of electrons is moving at 250 m/s downward in a magnetic field is acted upon by a 200 N force towards the south. The field has a strength of .12 T towards the east. Calculate the charge on the electrons.

• .096 C

• 6.67 C

• 10.4 C

• 3.27 C

A force of 5.7 E -15 N acts toward the west on a moving charge of .035 C. A magnetic field of .65 T is directed down. Calculate the velocity of the electron.

• 4.8 E -12

• 1.05 E -13

• 3.9 E -12

• 2.5 E -13

A wire carrying a current of 3.4 A east is perpendicular to a magnetic field of .08 T downward. The force on the wire is 2.3 N. Calculate the length of the wire.

• 8.5 m

• .12 m

• 9.7 m

• .074 m

What is the current of a .004 m wire in a .86 T magnetic field, with a force of 4.2 E -3 ?

• .82 A

• 2.04 A

• 1.2 A

• 1.83 A