direction of flux

direction of rotation of a generator

direction of current in a motor

direction of induced emf

Faraday's law of electrolysis

Fleming's left hand rule

Lenz's law

Faraday's law of electromagnetic induction

increased by 6 times

decreased by 6 times

increased by 3 times

decreased by 3 times

paper

wood

fibre

mica

increasing the emf of the generator

increasing the counter emf

reducing the strength of the main field flux

reducing the sparking at the commutator segment