The magnetic field B, at all points within a circular region of radius R, is uni
ID: 2121918 • Letter: T
Question
The magnetic field B, at all points within a circular region of radius R, is uniform in space and directed into the plane of the page as shown in the figure (Figure 1) . (The region could be a cross section inside the windings of a long, straight solenoid.)
1) If the magnetic field is increasing at a rate dB/dt, what is the magnitude of the force on a stationary positive point charge q located at point a? (Point a is a distance r above the center of the region.)
a=(qr) dB/dt
b=(1/2)q dB/dt
c=q dB/dt
d=(1/2)qr dB/dt
2) If the magnetic field is increasing at a rate dB/dt, what are the direction of the force on a stationary positive point charge q located at point a?
a= up
b= down
c= left
d= right
e= 0
3) If the magnetic field is increasing at a rate dB/dt, what is the magnitude of the force on a stationary positive point charge q located at point b?
a= (1/2)q dB/dt
b= (1/2)qr dB/dt
c= q dB/dt
d= qr dB/dt
4) If the magnetic field is increasing at a rate dB/dt, what is the direction of the force on a stationary positive point charge q located at point b?
a= 0
b= up
c= right
d= left
e= down
5) If the magnetic field is increasing at a rate dB/dt, what is the magnitude of the force on a stationary positive point charge q located at point c?
F=?
6) If the magnetic field is increasing at a rate dB/dt, what is the direction of the force on a stationary positive point charge q located at point c?
a= left
b= up
c= down
d= 0
e= right
Explanation / Answer
The correct answers are
A) (1/2)qr(dB/dt)
B) Left
C) (1/2)qr(dB/dt)
D) Up
E) 0
F) zero
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