Magnetism

A positive charge is moving to the right and experiences an upward magnetic force, as shown in the figure. In which direction must the magnetic field have a component? Select one: a. into the page b. upward c. to the right d. out of the page e. to the left

a

A proton traveling due west in a region that contains only a magnetic field experiences a vertically upward force (away from the surface of the earth). What is the direction of the magnetic field? Select one: a. north b. south c. down d. east e. west

b

A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that acts on the proton? (e = 1.60 × 10-19 C) Select one: a. 4.2 × 10-16 N b. 3.4 × 10-16 N c. 6.7 × 10-16 N d. 0 N e. 13 × 10-16 N

c

A proton moving eastward with a velocity of 5.0 km/s enters a magnetic field of 0.20 T pointing northward. What are the magnitude and direction of the force that the magnetic field exerts on the proton? (e = 1.60 × 10-19 C) Select one: a. 1.1 × 10-16 N eastwards b. 0 N c. 1.6 × 10-16 N upwards d. 4.4 × 10-16 N westwards e. 1.6 × 10-16 N downwards

c

A proton travels at a speed of 5.0 × 107 m/s through a 1.0-T magnetic field. What is the magnitude of the magnetic force on the proton if the angle between the proton's velocity and the magnetic field vector is 30°? (e = 1.60 × 10-19 C) Select one: a. 2.0 × 10-12 N b. 2.0 × 10-14 N c. 4.0 × 10-12 N d. 4.0 × 10-14 N

c

An electron is moving to the right, as shown in the figure. Suddenly it encounters uniform magnetic field pointing out of the page. Which one of the three paths shown will it follow in the field? Select one: a. path c b. path b c. path a

c

A proton moving with a velocity of 4.0 × 104 m/s enters a magnetic field of 0.20 T. If the angle between the velocity of the proton and the direction of the magnetic field is 60°, what is the magnitude of the magnetic force on the proton? (e = 1.60 × 10-19 C) Select one: a. 1.8 × 10-15 N b. 2.2 × 10-15 N c. 0.60 × 10-15 N d. 1.1 × 10-15 N e. 3.3 × 10-15 N

d

Which one of the following statements concerning the magnetic field inside (far from the surface) a long, current-carrying solenoid is true? Select one: a. The magnetic field is independent of the number of windings. b. The magnetic field varies as 1/r as measured from the solenoid axis. c. The magnetic field is zero. d. The magnetic field is non-zero and nearly uniform. e. The magnetic field is independent of the current in the solenoid.

d