PHYS 122 Unit Quiz #5 With Complete Questions And
Accurate Answers
A loop of current-carrying wire has a magnetic dipole moment of 5.0 × 10-4 Am2. If the
dipole moment makes an angle of 57° with a magnetic field of 0.35 T, what is its potential
energy? - ANSWER -9.5 x 10-5 J
A proton (charge e), traveling perpendicular to a magnetic field, experiences the same force
as an alpha particle (charge 2e) which is also traveling perpendicular to the same field. The
ratio of their speeds, vproton/valpha is: - ANSWER 2
The Hall effect can be used to calculate the charge-carrier number density in a conductor. If a
conductor carrying a current of 2.0 A is 0.5 mm thick, and the Hall effect voltage is 4.5 μV
when it is in a uniform magnetic field of 1.2 T, what is the density of charge carriers in the
conductor? - ANSWER 6.7 x 1027/m3
A loop of wire carrying a current of 2.0 A is in the shape of a right triangle with two equal
sides, each 15 cm long. A 0.7 T uniform magnetic field is in the plane of the triangle and is
perpendicular to the hypotenuse. The resultant magnetic force on the two equal sides has a
magnitude of: - ANSWER 0.30N
A conducting strip of width 1.5 mm is in a magnetic field. As a result, there is a potential
difference of 4.3 mV across the width of the strip. What is the magnitude of the electric field
in the strip? - ANSWER 2.9 V/m
Accurate Answers
A loop of current-carrying wire has a magnetic dipole moment of 5.0 × 10-4 Am2. If the
dipole moment makes an angle of 57° with a magnetic field of 0.35 T, what is its potential
energy? - ANSWER -9.5 x 10-5 J
A proton (charge e), traveling perpendicular to a magnetic field, experiences the same force
as an alpha particle (charge 2e) which is also traveling perpendicular to the same field. The
ratio of their speeds, vproton/valpha is: - ANSWER 2
The Hall effect can be used to calculate the charge-carrier number density in a conductor. If a
conductor carrying a current of 2.0 A is 0.5 mm thick, and the Hall effect voltage is 4.5 μV
when it is in a uniform magnetic field of 1.2 T, what is the density of charge carriers in the
conductor? - ANSWER 6.7 x 1027/m3
A loop of wire carrying a current of 2.0 A is in the shape of a right triangle with two equal
sides, each 15 cm long. A 0.7 T uniform magnetic field is in the plane of the triangle and is
perpendicular to the hypotenuse. The resultant magnetic force on the two equal sides has a
magnitude of: - ANSWER 0.30N
A conducting strip of width 1.5 mm is in a magnetic field. As a result, there is a potential
difference of 4.3 mV across the width of the strip. What is the magnitude of the electric field
in the strip? - ANSWER 2.9 V/m
