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Standard VIII
Physics
Question

The intensity of the atmospheric electric field is, normally,
  1. greater in the middle of the day than at morning
  2. smaller in the middle of the day than at morning
  3. same in the middle of the day as at morning
  4. zero in the middle of the day and at morning

A
zero in the middle of the day and at morning
B
greater in the middle of the day than at morning
C
smaller in the middle of the day than at morning
D
same in the middle of the day as at morning
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Solution
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The fine day net positive charge sets up an electric field between the negative earth and the net positive charge in the air and this electric field stores electrical energy. The positive charge acts by induction on the earth and electromagnetic devices.

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