Magnetic fields

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

• Directed to the right

• Directed to the left

• Equal to the magnetic field

• In the same direction as the magnetic field

What does the following represent?

⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

• Multiplied by a billion

• A piece of modern art

• Uniform magnetic field directed into the screen away from you

• Uniform magnetic field directed out of your screen at you

Are the magnetic field lines in the picture correct?

• Yes, because they point from north to south.

• No, because they point from north to south (they're supposed to go the other way).

• Yes, because the North pole is on the left in all pictures.

• No, because the North pole is on the left in all pictures (it's supposed to be on the right).

Tags

NGSS.MS-PS2-3

The strongest part of a magnet is...

• the bars .

• the force field.

• the poles.

• the middle.

Tags

NGSS.MS-PS2-3

A straight wire carrying a 9.0 A current is in a uniform magnetic field oriented at right angles to the wire. When 75 cm of wire is in the field, the force on the wire is 1.2 N. What is the strength of the magnetic field (B)? HINT: F=I.L.B

• = 0.18 N
• = 0.18 T
• = 0.18 Cm
• = 0.18 

The SI unit of magnetic field is

• weber

• gauss

• tesla

• farad

What does the following represent?
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙

• A crowd with binoculars
• A bunch of coaxial cables 
• Uniform magnetic field directed into the screen away from you
• Uniform magnetic field directed out of your screen at you

force on a conductor carrying a current = 1.32 N, current = 4 A, length = 3.88 m, magnetic flux density = ?

• 0.0851

• 1.17

• 0.317

• 0.106

magnetic flux density = 0.45 T, current = 1.37 A, length = 1.9 m, force on a conductor carrying a current = ?

• 0.0851

• 1.17

• 0.317

• 0.106

force on a conductor carrying a current = 5.37 N, magnetic flux density = 3.91 T, current = 4.33 A, length = ?

• 0.0851

• 1.17

• 0.317

• 0.106