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AP® Physics C: E & M

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Moderate

What Makes B-Field

APPHEM-7MWY$P

The diagram shows a wire that is bent into a loop consisting of two straight segments 2 and 4 and two quarter-circular segments 1 and 3. Point P is at the curvature center of the curved segments and is collinear to segments 2 and 4. An unseen source of EMF causes a constant clockwise current to exist in the wire loop.

Which segments create a magnetic field at point P, and what is the direction of the fields that are created at point P?

A

Segment 1 creates magnetic field directed into the page, and Segment 3 creates magnetic field directed out of the page.

B

Segment 1 creates magnetic field directed out of the page, and Segment 3 creates magnetic field directed into the page.

C

Segment 2 creates magnetic field directed into the page, and Segment 4 creates magnetic field directed out of the page.

D

Segment 2 creates magnetic field directed out of the page, and Segment 4 creates magnetic field directed into the page.