(1) An e.m.f. is induced in a conductor when the magnetic field surrounding it changes.
(2) The magnitude of the e.m.f. is proportional to the rate of change of the field.
(3) The sense of the induced e.m.f. depends on the direction of the rate of change of the field.

• multiplication factor
• multiplicity
• multiplier
• multivibrator
• Mumetal
• Muntz metal
• muon
• musical scale
• mutarotation
• mutual inductance
• myopia
• Mössbauer effect
• n-type conductivity
• N.T.P.
• nabla
• nadir
• nand circuit
• nano-
• nanotechnology
• nanotube
• Napierian logarithm
• natural abundance
• natural frequency
• natural logarithm
• natural units