Magnetic Fields

A beam of electrons travels at 6.0×10⁶ m/s through a uniform magnetic field of   6.5×10⁻¹ T at right angles to the field. How strong is the force acting on each electron? 

• =  6.25×10⁻¹³ N
• =  −6.25×10⁻¹³ N
• =  −6.25×10⁻¹⁰ N
• =  −6.25×10⁻¹³ M

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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 

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A compass behaves as it does because each needle acts as a(n) ___________.

• Magnet
• Guide

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Magnetic poles that are unlike ________and magnetic poles that are alike ___________.

• run; stay
• attract; repel
• stay; repel
• repel; attract

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What is a magnetic field?

• purple lines with arrows
• area of magnetic force around a magnet
• it's like a really big football field
• area of a magnet around a magnetic force

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The SI unit of magnetic field is 

• weber
• guass
• tesla
• farad

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The strongest part of a magnet is...

• the bars.
• the force field.
• the poles. 
• the middle.

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There are several modern uses of magnets.  Magnets allow high speed trains to ______________________ above the track.  They go faster because without touching the tracks there is no friction to slow them down.

• collide
• levitate
• attract
• repair

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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).

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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

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