Magnetic Field-Quiz

1) A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

• A. Directed to the right

• A. Directed to the left

• A. Equal to the magnetic field

• In the same direction as the magnetic field

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

1) A solenoid with 500 turns, 0.10 m long, carrying a current of 4.0 A and with a radius of 10^2 m will have what strength magnetic field at its center?

• 31 x 10 ^{– 4} T

• 62 x 10 ^{– 4} T

• 125 x 10 ^{– 4} T

• 250 x 10 ^{– 4} T

Solenoid #1 has a length L, cross-sectional area A, and N turns. Solenoid #2 has a length 2L, cross-sectional area 2A, and 2N turns. Which solenoid has the greater magnetic field at its center when equal currents are going through them?

• #1

• #2

• Both have the same magnetic field.

• Since it depends on the values of A and L, none of the above are correct

1) Two long parallel wires 40 cm apart are carrying currents of 10 A and 20 A in the opposite direction. What is the magnitude of the magnetic field halfway between the wires?

• 1.0 x 10^-5 T

• 2.0 x 10^-5 T

• 3.0 x 10^-5 T

• 4.0 x 10^-5 T

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

1) A superconducting wire carries a current of 10^4 A. Find the magnetic field at a distance of 1.0 m from the wire.

• 2 x 10^-3 T

• 8 x 10^-3 T

• 1.6 x 10^-2 T

• 3.2 x 10^-2 T

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

1) A superconducting solenoid is to be designed to generate a magnetic field of 5.00 T. If the solenoid winding has 1000 turns/m, what is the required current?

• 1000 A

• 1990 A

• 3980 A

• 5000 A

Tags

NGSS.HS-PS2-5

1) A straight wire carries a current inside the paper. What is the direction of the magnetic field at point P?

• Points to the right

• Points to the left

• Points to the top of the page

• Points to the bottom of the page

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

1) A 3.25 A current is moving through a loop with 5 turns. What is the radius of the loop that produces a magnetic field of 3.4 x 10^-4 T at its center?

• 0.03 m

• 0.25 m

• 0.50 m

• 0.75 m

Tags

NGSS.HS-PS2-5

Two parallel wires of length 2 m are separated by 40 cm. If the magnetic force between the two wires is 2 ×10^-6 N and the current in the second wire is twice the current in the first one.

1) Which of the following is true concerning the force between the two wires:

• The magnetic force is a repulsion between wires

• The magnetic force is an attraction between the wires

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Two parallel wires of length 2 m are separated by 40 cm. If the magnetic force between the two wires is 2 ×10^-6 N and the current in the second wire is twice the current in the first one.

How much is the current I in the first wire?

• 1A

• 2A

• 3A

• 4A