http://maple.sinc.stonybrook.edu:8080/mapleta/web/P12PhFo115/Public_Html/cdSolen

Question

http://maple.sinc.stonybrook.edu:8080/mapleta/web/P12PhFo115/Public_Html/cdSolenoidPic.jpg

For the solenoid coil in the figure, which are true statements?



(A) positive steady current flowing from c to d creates a magnetic field that points to the right inside the solenoid.
(B) A positive steady current flowing from c to d creates a magnetic field that points to the right above the solenoid
(C) Looking from c to d, the solenoid is wound in the counter-clockwise direction.
(D) Just after switching on a negative current (viz., electrons) flowing from c to d, there is a magnetic flux inside the solenoid with an increasing magnitude
(E) With a steady current flowing from c to d, the magnetic fields above and below the solenoid point in the same directions
(F) A steady negative current (viz., electrons) flowing from c to d creates a magnetic field that points to the right inside the solenoid
(G) Just after switching on a negative current (viz., electrons) flowing from c to d, there is a magnetic flux outside the solenoid, at c, with a decreasing magnitude.

Explanation / Answer

(A) positive steady current flowing from c to d creates a magnetic field that points to the right inside the solenoid. G) Just after switching on a negative current (viz., electrons) flowing from c to d, there is a magnetic flux outside the solenoid, at c, with a decreasing magnitude.

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