U8: Electromagnetism Math Review

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

Determine the force acting on an .0025 C charge moving perpendicularly through a magnetic field of strength 0.978 T upward at a velocity of 230 m/s toward the east.

• 9406 N

• .56 N

• 1.5 N

• 214 N

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

What is the magnetic field of a .03 C charged particle that is traveling 400 m/s and exerts a force of 700 N?

• 58.3 T

• 19.04 T

• .0525 T

• 7.56 T