circular motion within a uniform magnetic field, B. If the charge is q and the
radius of its path is r, which of the following expressions gives the magnitude
of the particle’s linear momentum?
(A) qBr(B)
(C)
(D)
(E)
- A straight wire of length 2 m carries a 10-amp current. How much stronger
is the magnetic field at a distance of 2 cm from the wire than it is at 4 cm from
the wire?
(A) 2
(B) 2
(C) 4
(D) 4
(E) 8- Due to the magnetic force, a positively charged particle undergoes uniform
circular motion in a uniform magnetic field. Which of the following changes
could cause the radius of the circular path to decrease?
(A) Increase the mass of the particle
(B) Increase the speed of the particle
(C) Decrease the charge of the particle
(D) Decrease the strength of the magnetic field
(E) None of the above- In the figure below, what must be the direction of the magnetic field?