Which rule can be applied to determine the direction of induced emf in a generator?

The determination of the direction of induced electromotive force (emf) in a generator is best described using Fleming's Right Hand Rule. This rule is specifically designed to indicate the direction of current flow when a conductor moves through a magnetic field, which is the fundamental principle behind generating electrical energy in a generator.

When applying Fleming's Right Hand Rule, the thumb represents the direction of motion of the conductor (or the armature), the first finger indicates the direction of the magnetic field, and the second finger shows the direction of the induced current or emf. This visual aid helps engineers and technicians quickly ascertain how the physical movement and magnetic fields interact to produce electrical energy.

In contrast, other options like Fleming's Left Hand Rule are used primarily for motors, where current in a conductor creates motion, not the other way around. Faraday's Law provides the quantitative relationship between changing magnetic fields and the induced emf, but it does not specify direction. Ohm's Law relates voltage, current, and resistance but does not describe magnetic interactions or induced emf. Hence, Fleming's Right Hand Rule is the most applicable for determining the direction of induced emf in generators.