Question 1

If the charge carriers are positive instead of negative,what difference will result when measuring the Hall voltage?

Accepted Answer

A)  There is no difference. 
B)  Hall voltages will be double for positive charge carriers. 
C)  Hall voltages will be double for negative charge carriers. 
D)  The polarity of the voltage will be reversed. 
E)  Hall voltages cannot be measured for positive charge carriers. 
A)  There is no difference. 
B)  Hall voltages will be double for positive charge carriers. 
C)  Hall voltages will be double for negative charge carriers. 
D)  The polarity of the voltage will be reversed. 
E)  Hall voltages cannot be measured for positive charge carriers.

Question 2

Two parallel wires run in a north-south direction.The eastern wire carries 15.0 A southward while the western wire carries 6.0 A northward.If the wires are separated by 30 cm,what is the magnetic field direction at a point between the wires at a distance of 10 cm from the western wire?

Accepted Answer

A)  3.0 $\mu$T 
B)  6.0 $\mu$T 
C)  15 $\mu$T 
D)  27 $\mu$T 
E)  90 $\mu$T 
A)  3.0 $\mu$T 
B)  6.0 $\mu$T 
C)  15 $\mu$T 
D)  27 $\mu$T 
E)  90 $\mu$T

Question 3

A singly charged 9Be ion is accelerated from rest through a potential difference of 8000 V.The ion is then sent into a mass spectrometer where the radius of the path is 29 cm.What is the magnetic field in the spectrometer?

Accepted Answer

A)  0.27 T 
B)  0.13 T 
C)  0.067 T 
D)  0.0028 T 
E)  0.00019 T 
A)  0.27 T 
B)  0.13 T 
C)  0.067 T 
D)  0.0028 T 
E)  0.00019 T

Question 4

A proton is moving perpendicular to a magnetic field at 3.0 $\times$ 106 m/s and experiences a magnetic force of magnitude 2.5 $\times$ 10-16 N.What is the magnitude of the magnetic field?

Accepted Answer

A)  0.52 T 
B)  3.8 $\times$ 10-2 T 
C)  1.9 $\times$ 10-3 T 
D)  2.6 $\times$ 10-4 T 
E)  5.2 $\times$ 10-4 T 
A)  0.52 T 
B)  3.8 $\times$ 10-2 T 
C)  1.9 $\times$ 10-3 T 
D)  2.6 $\times$ 10-4 T 
E)  5.2 $\times$ 10-4 T

Question 5

The magnetic field inside a solenoid having 100 turns per cm at a current of 5.0 A is

Accepted Answer

A)  2.0 $\times$ 10-2 T. 
B)  1.0 $\times$ 10-2 T. 
C)  1.0 $\times$ 10-4 T. 
D)  6.3 $\times$ 10-4 T. 
E)  6.3 $\times$ 10-2 T. 
A)  2.0 $\times$ 10-2 T. 
B)  1.0 $\times$ 10-2 T. 
C)  1.0 $\times$ 10-4 T. 
D)  6.3 $\times$ 10-4 T. 
E)  6.3 $\times$ 10-2 T.

Question 6

Which of the following magnetic materials has domains?

Accepted Answer

A)  paramagnetic 
B)  diamagnetic 
C)  solenoidic 
D)  amperic 
E)  ferromagnetic 
A)  paramagnetic 
B)  diamagnetic 
C)  solenoidic 
D)  amperic 
E)  ferromagnetic

Question 7

A 10 m long wire carrying a current of 22 A makes an angle of 37$^{\circ}$ with the Earth's magnetic field of 0.51 mT.What is the magnetic force on the wire?

Accepted Answer

A)  0.11 N 
B)  0.068 N 
C)  0.19 N 
D)  0.090 N 
E)  0.011 N 
A)  0.11 N 
B)  0.068 N 
C)  0.19 N 
D)  0.090 N 
E)  0.011 N

Question 8

In a velocity selector for ions,when the electric field is increased 50%,what change in the magnetic field is necessary to select the same speed as before?

Accepted Answer

A)  a 50% decrease 
B)  a 25% decrease 
C)  no change 
D)  a 25% increase 
E)  a 50% increase 
A)  a 50% decrease 
B)  a 25% decrease 
C)  no change 
D)  a 25% increase 
E)  a 50% increase

Question 9

A proton is moving at 3.0 $\times$ 106 m/s and experiences a magnetic force of magnitude 2.5 $\times$ 10-16 N. If the magnetic field makes an angle of 40$^{\circ}$ with respect to the velocity of the proton,what is the field's magnitude?

Accepted Answer

A)  1.7 $\times$ 10-4 T 
B)  3.3 $\times$ 10-4 T 
C)  4.1 $\times$ 10-4 T 
D)  8.1 $\times$ 10-4 T 
E)  1.6 $\times$ 10-3 T 
A)  1.7 $\times$ 10-4 T 
B)  3.3 $\times$ 10-4 T 
C)  4.1 $\times$ 10-4 T 
D)  8.1 $\times$ 10-4 T 
E)  1.6 $\times$ 10-3 T

Question 10

A proton and electron,each travelling at the same speed,enter a region of uniform magnetic field.They experience

Accepted Answer

A)  forces in the same direction and having ratio Fp/Fe = me/mp 
B)  forces equal in magnitude,but opposite in direction 
C)  forces opposite in direction and having ratio Fp/Fe = me/mp 
D)  the same force 
A)  forces in the same direction and having ratio Fp/Fe = me/mp 
B)  forces equal in magnitude,but opposite in direction 
C)  forces opposite in direction and having ratio Fp/Fe = me/mp 
D)  the same force

Question 11

In diagrams of magnetic fields,the symbol "$\times$" is used to represent

Accepted Answer

A)  the region of no magnetic field. 
B)  the north magnetic field. 
C)  the magnetic field coming out of the paper. 
D)  the magnetic field going into the paper. 
E)  the magnetic field. 
A)  the region of no magnetic field. 
B)  the north magnetic field. 
C)  the magnetic field coming out of the paper. 
D)  the magnetic field going into the paper. 
E)  the magnetic field.

Question 12

A mass spectrometer splits a beam of 10B and 11B singly charged ions having the same velocity by passing the beam through a uniform magnetic field.If the radius of the path for the 10B ions is 12.0 cm,what will be the radius for the 11B ions?

Accepted Answer

A)  9.90 cm 
B)  10.9 cm 
C)  12.0 cm 
D)  13.2 cm 
E)  14.5 cm 
A)  9.90 cm 
B)  10.9 cm 
C)  12.0 cm 
D)  13.2 cm 
E)  14.5 cm

Exam 19: Magnetic Forces and Fields

If the charge carriers are positive instead of negative,what difference will result when measuring the Hall voltage?

Two parallel wires run in a north-south direction.The eastern wire carries 15.0 A southward while the western wire carries 6.0 A northward.If the wires are separated by 30 cm,what is the magnetic field direction at a point between the wires at a distance of 10 cm from the western wire?

A singly charged 9Be ion is accelerated from rest through a potential difference of 8000 V.The ion is then sent into a mass spectrometer where the radius of the path is 29 cm.What is the magnetic field in the spectrometer?

A proton is moving perpendicular to a magnetic field at 3.0 ×\times× 106 m/s and experiences a magnetic force of magnitude 2.5 ×\times× 10-16 N.What is the magnitude of the magnetic field?

The magnetic field inside a solenoid having 100 turns per cm at a current of 5.0 A is

Which of the following magnetic materials has domains?

A 10 m long wire carrying a current of 22 A makes an angle of 37 ∘^{\circ}∘ with the Earth's magnetic field of 0.51 mT.What is the magnetic force on the wire?

In a velocity selector for ions,when the electric field is increased 50%,what change in the magnetic field is necessary to select the same speed as before?

A proton is moving at 3.0 ×\times× 106 m/s and experiences a magnetic force of magnitude 2.5 ×\times× 10-16 N. If the magnetic field makes an angle of 40 ∘^{\circ}∘ with respect to the velocity of the proton,what is the field's magnitude?

A proton and electron,each travelling at the same speed,enter a region of uniform magnetic field.They experience

In diagrams of magnetic fields,the symbol " ×\times× " is used to represent

A mass spectrometer splits a beam of 10B and 11B singly charged ions having the same velocity by passing the beam through a uniform magnetic field.If the radius of the path for the 10B ions is 12.0 cm,what will be the radius for the 11B ions?

Introduction

Force

Acceleration and Newtons Second Law of Motion

Motion With Constant Acceleration

Circular Motion

Conservation of Energy

Linear Momentum

Torque and Angular Momentum

Fluids

Elasticity and Oscillations

Waves

Sound

Temperature and the Ideal Gas

Heat

Thermodynamics

Electric Forces and Fields

Electric Potential

Electric Current and Circuits

Electromagnetic Induction

Alternating Current

Electromagnetic Waves

Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Relativity

Early Quantum Physics and the Photon

Quantum Physics

Nuclear Physics

Particle Physics

Filters

A singly charged ⁹Be ion is accelerated from rest through a potential difference of 8000 V.The ion is then sent into a mass spectrometer where the radius of the path is 29 cm.What is the magnetic field in the spectrometer?

A proton is moving perpendicular to a magnetic field at 3.0 $\times$ 10⁶ m/s and experiences a magnetic force of magnitude 2.5 $\times$ 10^-16 N.What is the magnitude of the magnetic field?

A 10 m long wire carrying a current of 22 A makes an angle of 37 $^{\circ}$ with the Earth's magnetic field of 0.51 mT.What is the magnetic force on the wire?

A proton is moving at 3.0 $\times$ 10⁶ m/s and experiences a magnetic force of magnitude 2.5 $\times$ 10^-16 N. If the magnetic field makes an angle of 40 $^{\circ}$ with respect to the velocity of the proton,what is the field's magnitude?

In diagrams of magnetic fields,the symbol " $\times$ " is used to represent

A mass spectrometer splits a beam of ¹⁰B and ¹¹B singly charged ions having the same velocity by passing the beam through a uniform magnetic field.If the radius of the path for the ¹⁰B ions is 12.0 cm,what will be the radius for the ¹¹B ions?