1 2 3 4 5

20% 20% 20%20%20%

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1. 2.

3.

4. 5.

1 2 3 4 5

20% 20% 20%20%20%

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1. 1.5 mT

2. 6.6 mT

3. 5.9 mT

4. 1.3 mT

5. 4.1 mT

A 6.0-C charge moves with a velocity of (2.0i + 4.0j + 6.0k) m/s and experiences a magnetic force of (4.0i - 20j + 12k) N. The x component of the magnetic field is equal to zero. Determine the y component of the magnetic field.

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20% 20% 20%20%20%

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1. + 1.0 T

2. - 1.0 T

3. + 5.0 T

4. - 5.0 T

5. - 6.0 T

1 2 3 4 5

20% 20% 20%20%20%

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1. 2.

3.

4. 5.

A positively charged particle has a velocity in the positive z direction at point P. The magnetic force on the particle at this point is in the positive y direction. Which one of the following statements about the magnetic field at point P can be determined from this data?

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20% 20% 20%20%20%

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1. 2.

3.

4. 5.

A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a upward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the west with speed V?

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20% 20% 20%20%20%

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1. QVB toward the north

2. QVB toward the east

3. Zero

4. QVB downward

5. QVB toward the south

A 2.0-m wire carries a current of 35 A directed along the positive x axis in a region where the magnetic field is uniform and given by B = (30i - 70j) mT. What is the resulting magnetic force on the wire?

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20% 20% 20%20%20%

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1. (- 4.9 k) N

2. (+ 4.9 k) N

3. (- 9.8 k) N

4. (+ 9.8 k) N

5. (+ 0.80 k) N

A segment of wire carries a current of 26 A along the x axis from x = - 1.0 m to x = 0 and then along the y axis from y = 0 to y = 2.0 m. In this region of space, the magnetic field is equal to 30 mT in the positive z direction. What is the magnitude of the force on this segment of wire?

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20% 20% 20%20%20%

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1. 1.7 N

2. 8.3 N

3. 2.7 N

4. 6.2 N

5. 9.3 N

1 2 3 4 5

20% 20% 20%20%20%

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1. 25 mT

2. 65 mT

3. 57 mT

4. 33 mT

5. 62 mT

1 2 3 4 5

20% 20% 20%20%20%

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1. 2.

3.

4. 5.

1 2 3 4 5

20% 20% 20%20%20%

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

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1. 2.

3.

4. 5.

1 2 3 4 5

20% 20% 20%20%20%

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1. 34 A

2. 49 A

3. 71 A

4. 72 A

5. 87 A

1 2 3 4 5

20% 20% 20%20%20%

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1. 0.53 N

2. 0.76 N

3. 0.75 N

4. 0.32 N

5. 0.50 N

1 2 3 4 5

20% 20% 20%20%20%

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1.

2.

3.

4. 5.

1 2 3 4 5

20% 20% 20%20%20%

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

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1. 0.60 T

2. 0.71 T

3. 1.8 T

4. 1.9 T

5. 2.1 T

1 2 3 4 5

20% 20% 20%20%20%

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1. 36 mm

2. 26 mm

3. 57 mm

4. 28 mm

5. 7.7 mm

A 900-eV electron and a 400-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?

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20% 20% 20%20%20%

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1. 1.5

2. 2.2

3. 2.4

4. 4.2

5. 2.0

1 2 3 4 5

20% 20% 20%20%20%

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1. 36 km

2. 77 km

3. 91 km

4. 71 km

5. 3.2 km

A charged particle moves in a region of uniform magnetic field along a helical path (radius = 4.0 cm, pitch = 19 cm, period = 5.0 ms). What is the speed of this particle as it moves along this path?

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20% 20% 20%20%20%

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1. 63 m/s

2. 69 m/s

3. 29 m/s

4. 20 m/s

5. 60 m/s

Two single charged ions moving perpendicularly to a uniform magnetic field (B = 0.5 T) with speeds of 5,000 km/s follow circular paths that differ in diameter by 6.0 cm. What is the difference in the mass of these two ions?

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1. 2.

3.

4. 5.

What is the radius of curvature of the path of a 1.0-keV proton in a perpendicular magnetic field of magnitude 0.90 T?

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20% 20% 20%20%20%

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1. 5.1 mm

2. 3.9 mm

3. 1.9 cm

4. 1.5 cm

5. 1.6 cm

1 2 3 4 5

20% 20% 20%20%20%

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1. 2.4 mm

2. 5.8 mm

3. 5.4 mm

4. 5.6 mm

5. 11 mm

A proton with a kinetic energy of 0.30 keV follows a circular path in a region where the magnetic field is uniform and has a magnitude of 50 mT. What is the radius of this path?

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20% 20% 20%20%20%

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1. 5.0 cm

2. 4.1 cm

3. 7.2 cm

4. 6.6 cm

5. 3.5 cm

A proton is accelerated from rest through a potential difference of 6.5 kV and then moves perpendicularly through a uniform 0.40-T magnetic field. What is the radius of the resulting path?

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20% 20% 20%20%20%

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1. 29 mm

2. 20 mm

3. 82 mm

4. 47 mm

5. 2.2 mm

What is the kinetic energy of an electron that passes undeflected through perpendicular electric and magnetic fields if E = 4.0 kV/m and B = 8.0 mT?

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20% 20% 20%20%20%

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1. 0.71 eV

2. 0.81 eV

3. 0.92 eV

4. 0.38 eV

5. 1.7 eV

A velocity selector uses a fixed electric field of magnitude E and the magnetic field is varied to select particles of various energies. If a magnetic field of magnitude B is used to select a particle of a certain energy and mass, what magnitude of magnetic field is needed to select a particle of equal mass but three times the energy?

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1. 0.58 B

2. 0.33 B

3. 3.0 B

4. 1.7 B

5. 2.4 B

1 2 3 4 5

20% 20% 20%20%20%

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1. is in opposite directions in electric and magnetic fields

2. is in the same direction in electric and magnetic fields

3. is parallel to a magnetic field and perpendicular to an electric field

4. is parallel to an electric field and perpendicular to a magnetic field

5. is zero in both if the charge is not moving

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20% 20% 20%20%20%

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1. A net force to the left.

2. A net force to the right.

3. A net force upwards.

4. No net force but a slight shift of the inner conductor to the right and the outer conductor to the left.

5. No net force but a slight shift of the inner conductor to the left and the outer conductor to the right.

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1. 2.

3.

4. 5.

The north-pole end of a bar magnet is held near a positively charged piece of plastic. The plastic is _____.

1 2 3

33% 33%33%

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1. attracted

2. repelled

3. unaffected by the magnet

An electron moves in the plane of this paper toward the top of the page. A magnetic field is also in the plane of the page and directed toward the right. The direction of the magnetic force on the electron is _____.

1 2 3 4 5 6

17% 17% 17%17%17%17%

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1. toward the top of the page

2. toward the bottom of the page

3. toward the left edge of the page

4. toward the right edge of the page

5. upward out of the page

6. downward into the page

A wire carries current in the plane of this paper toward the top of the page. The wire experiences a magnetic force toward the right edge of the page. The direction of the magnetic field causing this force is _____.

1 2 3 4

25% 25%25%25%

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1. in the plane of the page and toward the left edge

2. in the plane of the page and toward the bottom edge

3. upward out of the page

4. downward into the page

1 2 3 4 5

20% 20% 20%20%20%

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1. 2.

3.

4. 5.

1 2 3

33% 33%33%

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

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41 42 43 44 45 46 47 48 49 50

1. smaller

2. larger

3. equal in size