A rectangular coil ABCD is placed in a uniform magnetic field directed from north to south
MATHEMATICS · Single correct · A Level · Mathematics · Forces and Newton's laws · Forces and Newton's laws
Problem
A rectangular coil ABCD is placed in a uniform magnetic field directed from north to south. Sides AB and CD (each 6cm) lie along the east–west line, while sides BC and AD (each 4cm) lie along the north–south line. The coil carries a current of 5A in the order A→B→C→D→A. Which statement correctly describes the forces on AB and CD and the resulting motion of the coil?
(a) AB experiences an upward force and CD a downward force, producing clockwise rotation when viewed from the east end
(b) No force acts on AB or CD because both are parallel to the magnetic field
(c) AB experiences a downward force and CD an upward force, producing clockwise rotation when viewed from the east end
(d) AB experiences a downward force and CD an upward force, producing anticlockwise rotation when viewed from the east end