Figure 6
From: Wireless control and selection of forces and torques - towards wireless engines
Rotational effects on an LC resonator.
(a), The schematic of the experimental setup and calculated torque. μ is the magnetic dipole moment and 
is the magnetic flux density. Due to the sudden phase change in the current at resonance frequency, the resonator feels opposite torques below and above resonance (See supplementary movie 1 for experimental demonstration). Above resonance, the current in the resonator Ir produces a magnetic field 
opposite to the exciting field 
, while it supports a field in the same direction as the exciting field below resonance. (b), Stable equilibrium of the resonator below resonance. The axis of the coil is parallel to the exciting field. (c), Stable equilibrium of the resonator above resonance. The axis of the coil is perpendicular to the exciting field.
