Starting outside the region with the magnetic field, a single square coil of wire enters, moves across, and then leaves the region with a uniform magnetic field
perpendicular to the page so that the graph shown below represents the induced emf. The loop moves at constant velocity
. As seen from above, a counterclockwise emf is regarded as positive. In which direction did the loop move over the plane of the page?
a.
The loop moved from bottom to top.
b.
The loop moved from top to bottom.
c.
The loop moved from left to right.
d.
The loop moved from right to left.
e.
All of these directions of motion will produce the graph of emf vs
t.
[Ques. 2] Starting outside the region with the magnetic field, a single square coil of wire enters, moves across, and then leaves the region with a uniform magnetic field
perpendicular to the page so that the graph shown below represents the induced emf. The loop moves at constant velocity
. As seen from above, a counterclockwise emf is regarded as positive. In which direction did the loop move over the plane of the page?
a.
The loop moved from bottom to top.
b.
The loop moved from top to bottom.
c.
The loop moved from left to right.
d.
The loop moved from right to left.
e.
All of these directions of motion will produce the graph of emf vs
t.
[Ques. 3] Starting outside the region with the magnetic field, a single square coil of wire moves across the region with a uniform magnetic field
perpendicular to the page. The loop moves at constant velocity
. As seen from above, a counterclockwise emf is regarded as positive. Roger claims that the graph shown below represents the induced emf. Martin says he's wrong. In which direction did the loop move over the plane of the page, or is Martin correct?
a.
Roger is correct: the loop moved from bottom to top.
b.
Roger is correct: the loop moved from top to bottom.
c.
Roger is correct: the loop moved from left to right.
d.
Roger is correct: the loop moved from right to left.
e.
Martin is correct: none of these directions of motion will produce the graph of emf vs
t.
[Ques. 4] As shown below, a square loop of wire of side
a moves through a uniform magnetic field of magnitude
B perpendicular to the page at constant velocity
directed to the right. Which statement regarding the electric field induced in the wires is correct for the wires at the left and right sides of the loop?
a.
The electric field
is directed upwards in both the right and left sides of the loop.
b.
The electric field
is directed upwards in the right side and downwards in the left side of the loop.
c.
The electric field
is directed upwards in the left side and downwards in the right side of the loop.
d.
The electric field
is directed downwards in both the right and left sides of the loop.
e.
There is no electric field present in any side of the loop.
[Ques. 5] As shown below, a square loop of wire of side
a moves through a uniform magnetic field of magnitude
B perpendicular to the page at constant velocity
directed to the right. Judd says that the emf induced in the loop is zero. Roger claims that it has magnitude
B
. Which one, if either, is correct, and why?
a.
Judd, because the magnetic flux through the loop is constant.
b.
Roger, because the magnetic flux through the loop is constant.
c.
Judd, because the magnetic flux through the loop is not constant if
.
d.
Roger, because the magnetic flux through the loop is not constant if
.
e.
Roger, because the magnetic flux through the loop is
B = 0.
[Ques. 6]
[Ques. 7] Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is open,
a.
bulb 1 is glowing; bulb 2 is dark.
b.
bulb 2 is glowing; bulb 1 is dark.
c.
both bulbs glow equally brightly.
d.
both bulbs glow one half as brightly as they do with the switch closed.
e.
both bulbs are dark.
[Ques. 8] Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is closed,
a.
bulb 1 glows more brightly.
b.
bulb 2 glows more brightly.
c.
both bulbs glow equally brightly.
d.
bulb 1 goes out.
e.
bulb 2 goes out.
[Ques. 9] Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is closed,
a.
bulb 1 glows more brightly.
b.
bulb 2 glows more brightly.
c.
both bulbs continue to glow with the same brightness.
d.
bulb 1 goes out.
e.
bulb 2 goes out.
[Ques. 10] A metal rod of length L in a region of space where a constant magnetic field points into the page rotates clockwise about an axis through its center at constant angular velocity . While it rotates, the point(s) at lowest potential is(are)
a.
A.
b.
B.
c.
C.
d.
D.
e.
A and E.
Quick Reply
