Question 1

A loop of wire has a resistance of 8 and a cross-sectional area 0.02 m². The loop is perpendicular to a uniform magnetic field that increases steadily from 0.2 T to 2.8 T in 2.2 seconds. What is the magnitude of the induced current in the loop?

Group of answer choices

1.17 x 10^-3 A

5.81 x 10^-3 A

2.95 x 10^-3A

3.66 x 10^-3 A

Question 2

A circular loop carries a current of 2 A. The loop has an area of 0.12 m2 and its plane is oriented at a 37 angle to the field, and the field has magnitude of 3.5 T.. What is the magnitude of the magnetic torque on the loop?

Group of answer choices

6.7 x 10^-7T

2.9 x 10^-3 T

1.3 x 10^-7 T

4.9 x 10^-6 T

Question 3

A single-turned flat circular loop of diameter 10 cm is positioned with its plane perpendicular to a uniform 0.60 T magnetic field. The area of the loop is instantaneously reduced to essentially zero in 0.50 x 10^-3 s. What emf is induced in the loop?

Group of answer choices

7.2 V

5.8 V

10.3 V

9.4 V

Question 4

A straight wire is carrying a current of 2 A. It is placed at an angle of 60 with respect to a magnetic field of strength 0.20 T. If the wire experiences a force of 0.40 N, what is the length of the wire?

Group of answer choices

0.7 m

2.3 m

1.6 m

1.2 m

Question 5

A proton moving at 5.0 10⁴ m/s horizontally enters a region where a magnetic field of 0.12 T is present, directed vertically downward. What is the magnitude of the magnetic force on the proton?

Group of answer choices

1.6 x 10^-19 N

9.6 x 10^-16N

4.5 x 10^-17 N

1.3 x 10^-15 N

Question 6

A very long wire carrying a 2 A current is placed along the y-axis. What is the magnitude of the magnetic field at a point that is 0.60 m from the origin along the x-axis?

Group of answer choices

0.67 x 10^-6T

1.34 x 10^-6T

5.82 x 10^-6T

3.22 x 10^-6T

Question 7

The magnetic field at point P due to a 2.0-A current flowing in a long, straight, thin wire is 8 T. How far is point P from the wire?

Group of answer choices

5 cm

25 cm

9 cm

18 cm

Question 8

A flat circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

Group of answer choices

1.8 10^-3 T m²

6.3 10^-3 T m²

2.2 10^-3 T m²

4.7 10^-3 T m²

Question 9

If the index of refraction of a material is 2, this means that light travels

Group of answer choices

2 times as fast in vacuum as it does in the material.

1/2 as fast in air as it does in the material.

2 times as fast in air as it does in vacuum.

2 times as fast in the material as it does in air.

Question 10

Light goes from material having a refractive index of n1 into a material with refractive index n2. If the refracted light is bent away from the normal, what can you conclude about the indices of refraction?

Group of answer choices

n₁ = 2n₂

n₁ = n₂

n₂ > n₁

n₁> n₂

Question 11

An object is placed 12 cm in front of a concave mirror. If the image is 3.0 cm in front of the mirror, what is the focal length of the mirror?

Group of answer choices

-0.75 cm

-5.2 cm

1.3 cm

2.4 cm

Question 12

In a two-slit experiment, monochromatic coherent light of wavelength 600 nm passes through a pair of slits separated by 2.2 m. At what angle away from the centerline does the first bright fringe occur?

Group of answer choices

3.12

2.48

1.56

0.65

Question 13

A thin copper rod of length L = 1 m has a mass of 0.050 kg. It is placed in a uniform magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to balance the weight of the rod?

Group of answer choices

1.6 A

0.88 A

2.7 A

4.9 A

Question 14

A narrow flashlight beam traveling in air strikes a glass plate at an angle of 52 with the plane of the surface of the plate. If the index of refraction of the glass is 1.4, what angle will the beam make with the normal in the glass?

Group of answer choices

75

8

26

14

Question 15

The primary of an ideal transformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

Group of answer choices

150 V

50 V

75 V

200 V

Question 16

The magnetic flux through a coil increases uniformly from 4.0 10^-5 T m² to 5.0 10^-5 T m² in 0.10 s. What emf is induced in this coil?

Group of answer choices

7 10^-6 V

4 10^-5 V

3 10^-4 V

1 10^-4V

Question 17

What is the magnetic moment of a rectangular loop with 120 turns that carries 6 A. The dimensions of the rectangle are 4 cm 8 cm?

Group of answer choices

1.1 A m²

4.5 A m²

2.3 A m²

0.8 A m²

Question 18

An electron is moving perpendicular to a uniform magnetic field of 3.2 10^-2T moves in a circle of radius 0.40 cm. What is the electron's speed?

Group of answer choices

2.9 x 10⁸ m/s

1.4 x 10⁸ m/s

7.4 x 10⁷ m/s

2.2 x 10⁷ m/s

Question 19

A ray of light traveling in air makes a 63.0 angle with respect to the normal of the surface of a liquid. It travels in the liquid at a 39.2 angle with respect to the normal. Find the critical angle for total internal reflection for this interface.

Group of answer choices

7.9

15.7

21.3

45.2

Question 20

A beam of light enters a plastic sheet from the air at an angle of incidence of 32 with the normal and continues in the sheet at an angle of 23 with the normal. What is the index of refraction of the plastic?

Group of answer choices

1.36

1.21

2.15

1.48