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A long wire that is at rest in the Earth reference frame initially carries no current....

A long wire that is at rest in the Earth reference frame initially carries no current. Observer E in this reference frame measures linear charge densities of ?En = 45.00 ?C/m for the (negative) electrons in the wire and ?Ep = 60.00 ?C/m for the positive ions. A current is created as electrons are made to move through the wire at speed v, M moves along with the electrons at their speed v.

What value must v have in order for M to measure an electric field of magnitude E = 3.15 × 107 N/C at a distance 0.0100 m above the wire?

Express your answer to two significant digits and include the appropriate units.

v =2.80{\cdot}10^{-7} incorrect

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メ10 0:01 1 l O 6 と う 60+4SV-178

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