NEET PhysicsClass 12Motional emfMediumSingle correct

A metal rod of length 0.50 m slides at a constant 4.0 m s⁻¹ along two frictionless horizontal rails joined by a 2.0 Ω resistor. A uniform field of 0.30 T acts vertically. Neglecting the resistance of the rod and rails, what external force is needed to keep the rod moving at constant speed?

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A metal rod of length 0.50 m slides at a constant 4.0 m s⁻¹ along two frictionless horizontal rails joined by a 2.0 Ω resistor. A uniform field of 0.30 T acts vertically. Neglecting the resistance of the rod and rails, what external force is needed to keep the rod moving at constant speed?

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