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Question

Fill in the blanks
i) For a motor : a permanent magnet, then commercial motor : _______
ii) Focal length of a lens; metre, then for power of a lens ___________

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Solution

(1)Since permanent magnet cannot be large, hence electric magnets are used by the property of magnetic field created by moving charges.
(2)Since power is given by P=1focal length of lens in m
Hence unit of power is m1 or Diopter.

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