on Conceptual Questions (5 points per question): 1. A constant current is sent t

Question

on Conceptual Questions (5 points per question): 1. A constant current is sent through a helical coil. The coil A. Tends to get shorter B. Tends to get longer C. Tends to rotate about its axis D. Produces zero magnetic field at its center E. None of the above 2. A toroid with a square cross section carries current I The magnetic field has its largest magnitude: A. At the center of the hole B. Just inside the toroid at its inner surface C Just inside the toroid at its outer surface D. At any point inside (the field is uniform) E. None of these Objective Questions (5 points per question) 3. In the figure below find the direction of the current in the wire that would produce a magnetic field directed as shown. A. Out of the page B Into the page

Explanation / Answer

1) (A) tends to get shorter.

It will tend to shorten, just use the direction of current to find the direction of magnetic field on the wires near and opposite to it.

Then since you have the direction of the current in those wires find the direction of force on them.

You'll find that the force is radially inward (almost).

2) (B) just inside the toroid at its inner surface.

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