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PHYSICS 232
Midterm 2, March 25 , 1996, 10:00am-11:00am
Instructor: P. Q. Hung

25 points for each problem. READ the problems carefully. SHOW YOUR WORK. DO NOT JUST write the answers down.

Useful formulas (NOT necessarily ALL applied to the problems below):

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) A proton with velocity tex2html_wrap_inline150 moves through a magnetic field tex2html_wrap_inline152 . Calculate the force on the proton.

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) A coaxial cable consists of a central wire that carries current I to the right and a tube centered on the central wire that carries the same current to the left. Find the magnetic field outside the cable.

Looking head on at the coaxial cable, we see:

**fig**

Choosing a path around the cable, Ampere's Law gives us

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Salvatore John Dibartolo
Mon Jan 13 16:02:56 EST 1997