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

due to over commutation

due to under commutation

Both 1) due to over commutation and 2) due to under commutation

Neither "A" nor "B"