NEET 2018 Physics question
A metallic rod of mass per unit length is lying horizontally on a smooth inclined plane which makes an angle of with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is
Answer: (4)
Solution
The rod is horizontal and is vertical, so the magnetic force is horizontal and perpendicular to the rod, i.e. in the vertical plane that contains the line of greatest slope. For equilibrium on the smooth incline, the component of this force along the incline must balance the component of weight along
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