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

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

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

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

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.HS-PS2-5

NGSS.HS-PS3-5

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)?

• = 0.18 N

• = 0.18 T

• = 0.18 Cm

• = 0.18

The SI unit of magnetic field is

• weber

• gauss

• tesla

• farad

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

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

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

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

A proton moving at a speed of 2.0 $\times10^7m\ s^{-1}$ enters a uniform magnetic field perpendicular to the field. If the magnetic flux density is 2.5 Tesla, what is the magnetic force acting on the proton?

• 3.2 $\times10^{-12}N$  

• 4.0 $\times10^{-12}N$  

• 7.5 $\times10^{-12}N$  

• 8.0 $\times10^{-12}N$  

An  $\alpha-$ particle moving with a speed of 3.4 $\times10^7$ m  $s^{-1}$ enters a magnetic field in a direction perpendicular to the field with flux density 1.2 T. The particle moves in a circle of radius 0.45 m. If the charge of the  $\alpha-$ particle is 3.2 $\times10^{-19}$ C, what is the mass of the  $\alpha-$ particle?

• 1.7 $\times10^{-27}kg$  

• 3.8 $\times10^{-27}kg$  

• 5.1 $\times10^{-27}kg$  

• 6.8 $\times10^{-27}kg$  

An electron is moving with a speed of 3.4 $\times10^7m\ s^{-1}$ perpendicular to a uniform magnetic field of flux density 2.0 T. If the mass of the electron is 9.0 $\times10^{-31}kg$ , calculate the acceleration of the electron in the magnetic field.

• 1.2 $\times10^9\ m\ s^{-2}$  

• 2.7 $\times10^9\ m\ s^{-2}$  

• 5.4 $\times10^9\ m\ s^{-2}$  

• 6.1 $\times10^9\ m\ s^{-2}$  

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-5