The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.
[Ques. 2] The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
a.
D.
b.
E.
c.
F.
d.
G.
e.
H.
[Ques. 3] The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H.
When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
a.
A.
b.
B.
c.
C.
d.
D.
e.
E.
[Ques. 4] A coaxial cable has an inner cylindrical conductor surrounded by cylindrical insulation and an outer cylindrical conducting shell. The outer shell carries the same current but in the opposite direction from that in the inner conductor as shown. If the coaxial cable sits in a uniform magnetic field directed upwards with respect to the cable, the effect of the field on the cable is
a.
a net force to the left.
b.
a net force to the right.
c.
a net force upwards.
d.
no net force but a slight shift of the inner conductor to the left and the outer conductor to the right.
e.
no net force but a slight shift of the inner conductor to the right and the outer conductor to the left.
[Ques. 5] A magnetic field is directed out of the page. Two charged particles enter from the top and take the paths shown in the figure. Which statement is correct?
a.
Particle 1 has a positive charge and particle 2 has a negative charge.
b.
Both particles are positively charged.
c.
Both particles are negatively charged.
d.
Particle one has a negative charge and particle 2 has a positive charge.
e.
The direction of the paths depends on the magnitude of the velocity, not on the sign of the charge.
[Ques. 6] A current loop is oriented in three different positions relative to a uniform magnetic field. In position 1 the plane of the loop is perpendicular to the field lines. In position 2 and 3 the plane of the loop is parallel to the field as shown. The torque on the loop is maximum in
a.
position 1.
b.
position 2.
c.
position 3
d.
positions 2 and 3.
e.
all three positions.
[Ques. 7] A charged particle (m = 2.0 g, q = 50 C) moves in a region of uniform field along a helical path (radius = 4.0 cm, pitch = 8.0 cm) as shown. What is the angle between the velocity of the particle and the magnetic field?
a.
27
b.
72
c.
63
d.
18
e.
58
[Ques. 8] The boundary shown is that of a uniform magnetic field directed in the positive z direction. An electron enters the magnetic field with a velocity pointing along the x axis and exits 0.63 s later at point A. What is the magnitude of the magnetic field?
a.
18
T
b.
14
T
c.
28
T
d.
34
T
e.
227
T
[Ques. 9] A uniform magnetic field of 0.50 T is directed along the positive x axis. A proton moving with a speed of 60 km/s enters this field. The helical path followed by the proton shown has a pitch of 5.0 mm. Determine the angle between the magnetic field and the velocity of the proton.
a.
39
b.
51
c.
44
d.
34
e.
71
[Ques. 10] A wire (mass = 50 g, length = 40 cm) is suspended horizontally by two vertical wires which conduct a current I = 8.0 A, as shown in the figure. The magnetic field in the region is into the paper and has a magnitude of 60 mT. What is the tension in either wire?
a.
0.15 N
b.
0.68 N
c.
0.30 N
d.
0.34 N
e.
0.10 N
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