# physics urgent

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a metal sample carrying a current along X-axis with density Jx is subjected to a magnetis field Bz(along z-axis). the electric field Ey developed along Y-axis is directly proportional to Jx as well as Bz. the constant of propotionality has SI unit.
1. m²/As
2. m²/A
3.As/m³
4. m³/As

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