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Home  >>  AIMS  >>  Class12  >>  Physics  >>  Electric Charges and Fields
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An infinite number of charge, each q coulomb, are placed along x-axis at x = 1m, 3m, 9m. Calculate the electric field at the point x = 0 due to these charges. If all the charges are of the same sign

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$\large\frac{1}{4 \pi \in _0} \frac{9q}{8} $$NC^{-1}$
Hence B is the correct answer.
answered May 30, 2014 by meena.p
 

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