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Home  >>  AIMS  >>  Class12  >>  Physics  >>  Electric Charges and Fields
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Write down the value of constant of proportionality $\large\frac{1}{4 \pi \in_0}$ involved in expression for Coulomb's force between two charges.

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1 Answer

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$(B)\;9 × 10^{9} N m^2 C^{–2}$.
Hence B is the correct answer.
answered Jun 5, 2014 by meena.p
 

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