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A wire, of length L(=20cm) is bent into a semi- circular arc. If the two equal halves , of the arc, were each to be uniformly chraged with charges [ ±Q,|Q|=1030 coulomb where 0 is the permittivity (in SI units)of free space] the net electric field at the center O of the semi circular arc would be :

(50×103N/C)ˆj(25×103N/C)ˆi(25×103N/C)ˆj(50×103N/C)ˆi

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