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Exam (elaborations)

Assignment 9 (1).

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Exam of 1 pages for the course MIE 305 NCSU Chapters 1-4 at MIE 305 NCSU Chapters 1-4 (Assignment 9 (1).)

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Assignment 9
Which describes the magnetic field lines near a long straight wire carrying current? - ANS-They
form concentric circles around the wire, in a plane perpendicular to the wire.

What do we calculate if we integrate length element ds around a full circle? - ANS-the
circumference of the circle

Which currents are included in a calculation of Ampere's law? - ANS-only currents that are
inside the loop of integration

Which is true about the magnetic field lines of a solenoid? - ANS-Internally, they are closely
spaced with a uniform spacing. Externally, they are more widely spaced with a nonuniform
spacing.

Which is true about the magnitude of the magnetic field inside a toroid? - ANS-It is inversely
proportional to the radius.

The magnetic field a distance 2 cm from a long straight current-carrying wire is 2 x 10-5 T. The
current in the wire is: - ANS-2.0 A

A constant current is sent through a helical coil made of flexible wire. The coil: - ANS-tends to
get shorter

A long straight cylindrical shell carries current i uniformly distributed over its cross section. The
magnitude of the magnetic field is greatest: - ANS-at the outer surface of the shell

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