Phys 313 Quiz 21

Question 1

A long wire carries a current to the right. The direction of the magnetic field at a point P above the wire is

• zero
• left
• out of the page

   Answer:  c. out of the page

Question 2

The magnetic field strength due to current running through a very long wire falls off as

• 1/r
• 1/r^2
• 1/r^3

   Answer:    a), 1/r

Question 3

Two parallel wires carry current in the same direction. The magnetic force between them is ...

   Answer:  attractive

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