A rectangular coil PQRS is hung so that sides PQ and RS are vertical and side PQ is…
PHYSICS · Single correct · AP · Physics 2: Algebra-based · Magnetism and Electromagnetism · Magnetism and Electromagnetism
Problem
A rectangular coil PQRS is hung so that sides PQ and RS are vertical and side PQ is on the left when viewed from the front. A uniform magnetic field acts horizontally from right to left. When current flows upward in side PQ and downward in side RS, what is the direction of the couple acting on the coil?
(a) Clockwise (when viewed from the front)
(b) No couple acts; the coil translates sideways
(c) The coil experiences a couple tending to twist it about a vertical axis
(d) The coil experiences a couple tending to rotate it about a horizontal axis