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Electric Charges and Fields — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectric Charges and Fields1 Mark
Question
Define the S.1. unit of electric charge (coulomb).
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Answer

One Coulomb charge is a charge which, if kept at a distance of 1 meter from itself in air or vacuum, repels its similar charge with a force of $9 \times 10^9$ Newton.

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