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12 45 R A 50 cm long metal rod moves along the two rails in...

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Physics

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12 45 R A 50 cm long metal rod moves along the two rails in a plane of the circuit shown and is placed perpendicular to the magnetic field indicated by x B 0 15 T If R 4 0 ohm and a constant force of 7 4 mN is needed to maintain the uniform speed v of the rod what would be this uniform speed 3 76 m s O 5 26 m s O 1 16 m s O 4 90 m s

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