Question

1. Which describes the vector calculation of the Biot-Savart law?

a. The length element in the direction of the
current is crossed into a vector directed from that element toward
the point of measurement.

b. The length element in the direction of the current
is dotted into a vector directed from that element toward the point
of measurement.

c. The magnetic field vector is crossed into a vector
directed from a current-length element toward the point of
measurement.

d. The magnetic field vector is dotted into a
vector directed from a current-length element toward the point of
measurement.

e. The magnetic field vector is crossed into a length
element in the direction of the current.

f. The magnetic
field vector is dotted into a length element in the direction of
the current.

2. Which describes the spacing of the magnetic field lines near a long straight wire carrying current?

a. The spacing increases as the distance from the
wire increases.

b. The spacing decreases as the distance from the wire
increases.

c. The spacing is uniform.

3. We set up two parallel currents in the same direction. Which describes the magnetic force on each wire due to the other wire?

a. The force on each current is in the direction of
the current.

b. The force on each current is in the direction
opposite that of the current.

c. The force on each current is perpendicular to the
current and toward the other current.

d. The force on each current is perpendicular to the
current and away from the other current.

4. We set up two parallel currents in the same direction. Which describes the magnetic field set up by current 1 at a point on current 2?

a. The field is in the direction opposite current
2.

b. The field is perpendicular to current 2.

c. The field is in the same direction as current
2.

5. What do we calculate if we integrate length element ds around a full circle?

a. the radius of the circle

b. the area of the circle

c. the circumference of the circle

d. the diameter of the circle

6. In Ampere’s law, when we integrate the magnetic field along a loop, which are summing?

a. the field components that are parallel to the
path elements, at every point along the loop

b. the field components that are perpendicular to the
path elements, at every point along the loop

c. the magnitudes of the field vectors at every point
along the loop

7. Which describes the magnetic field at a point inside a long wire that carries current uniformly across its circular cross-sectional area?

a. The field is directed radially inward.

b. The field is tangent to a circle through the point
and concentric with the wire.

c. The field is directed radially outward.

8. Which is true about a solenoid?

a. The internal magnetic field is approximately
uniform. The external magnetic field is weak.

b. The magnetic field is approximately uniform both
inside and outside the solenoid.

c. The internal magnetic field is weak. The external
magnetic field is approximately uniform.

9. In using Ampere’s law for a solenoid as in this section, which is true about the values of the integration parts?

a. The integrations parallel to the length of the
solenoid give a zero result; those perpendicular to the length give
a nonzero result.

b. The integrations parallel to the length of the
solenoid give a nonzero result; those perpendicular to the length
give a zero result.

c. The integrations parallel and perpendicular to the
length of the solenoid give a zero result.

d. The integrations parallel and perpendicular to the
length of the solenoid give a nonzero result.

10. Which describes the magnetic field along the central axis of a current loop?

a. The field is directed along the axis and away
from the loop on one side and toward the loop on the other
side.

b. The field is directed along the axis and toward the
loop on both sides of the loop.

c. The field is directed along the axis and away from
the loop on both sides of the loop.

d. The field is perpendicular to the axis.

Answer #1

1. Which describes the vector calculation of the Biot-Savart law?

a. The length element in the direction of the current is crossed into a vector directed from that element toward the point of measurement.

2. Which describes the spacing of the magnetic field lines near a long straight wire carrying current?

c. The spacing is uniform

3. We set up two parallel currents in the same direction. Which describes the magnetic force on each wire due to the other wire?

c. The force on each current is perpendicular to the current and toward the other current.

4. We set up two parallel currents in the same direction. Which describes the magnetic field set up by current 1 at a point on current 2?

b. The field is perpendicular to current 2.

5. What do we calculate if we integrate length element ds around a full circle?

c. the circumference of the circle

1. In Ampere’s law, when we integrate the magnetic field along a
loop, which are summing?
a. the field components that are parallel to the
path elements, at every point along the loop
b. the field components that are perpendicular to the
path elements, at every point along the loop
c. the magnitudes of the field vectors at every point
along the loop
2. Which describes the magnetic field at a point inside a long
wire that...

1. In Ampere’s law, when we integrate the magnetic field along a
loop, which are summing?
a. the field components that are parallel to the
path elements, at every point along the loop
b. the field components that are perpendicular to the
path elements, at every point along the loop
c. the magnitudes of the field vectors at every point
along the loop
2. Which describes the magnetic field at a point inside a long
wire that...

Indicate the direction of the induced current in the loop, given
that a magnetic field directed ‘away’ from the page (perpendicular
and along the center axis of the loop) is gaining strength.
(a) Direction will clockwise or counterclockwise.
with diagram of wire loop

A straight wire on the X-axis of FINITE length L
carries current I.
a. determine the magnetic field produced by the wire at a point P1,
a perpendicular distance a from one end if the wire. (up from the
right end Of wire)
b. determine the magnetic field produced by the wire at a point P2,
a distance b from one end of the wire along the symmetry axis of
the wire, (right end of wire on x axis)

As shown in the figure below, two long parallel wires (1 and 2)
carry currents of I1 = 3.32 A and I2 = 4.50 A in the direction
indicated. Two parallel wires point into the page. They are a
distance d apart from each other, with the left wire labeled I_1 at
the origin and the right wire labeled I_2 a distance d along the
positive x-axis. There is a point labeled P directly above wire I_1
a distance d...

The strength of the magnetic field within a solenoid is B = 2.1
× 10-2 T (outside the solenoid B = 0). A smaller, single
loop is placed in the solenoid parallel to the plane of each loop
in the solenoid. The resistance of the solenoid is 5.9 W, the
resistance of the loop is 0.27 W, the diameter of the solenoid is
0.09 m, and the diameter of the loop is 0.05 m. An emf of 12 V is...

A wire, of length L = 4.9
mm, on a circuit board carries a current of I = 2.89 μA in
the j direction. A nearby circuit element
generates a magnetic field in the vicinity of the wire of
B = Bxi +
Byj +
Bzk, where
Bx = 3.8 G, By = 4.3 G, and
Bz = -2.9 G.
17% Part (a) Calculate
the magnitude of the magnetic field B, in gauss, in the
vicinity of the wire due...

Three infinite straight wires are fixed in place and aligned
parallel to the z-axis as shown. The wire at (x,y) = (-19 cm, 0)
carries current I1 = 2.9 A in the negative z-direction.
The wire at (x,y) = (19 cm, 0) carries current I2 = 0.5
A in the positive z-direction. The wire at (x,y) = (0, 32.9 cm)
carries current I3 = 6.2 A in the positive
z-direction.
1. What is Bx(0,0), the x-component of the magnetic
field...

1) A circular loop of radius 3.53 cm contains 61 turns of
tightly wound wire. If the current in the windings is 0.634 A and a
constant magnetic field of 0.462 T makes an angle of 70.3 ◦ with a
vector perpendicular with the loop, what torque acts on the
loop?
2) The clockwise circulating current in a solenoid is increasing
at a rate of 13 A/s. The crosssectional area of the solenoid is
3.14159 cm2 , and there are...

A magnetic field, strength 3T, has a direction out of the page.
A loop of wire sits in the field and on the plane of the page (area
vector of loop is out of page). The loop is much smaller than the
extent of the field. The magnetic field starts to slowly change at
a rate of -0.0001T/s. Looking down on the loop, which statement is
correct?
A. Magnetic flux out of page decreasing; anti-clockwise current
induced in loop
B....

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