As shown in the figure, a metallic rod of linear density 0 . 45kg m ^ - 1 is lying horizontally on a smooth incline plane which makes an angle of 45 ° with the horizontal. The minimum current flowing in the rod

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As shown in the figure, a metallic rod of linear density 0 . 45kg m ^ - 1 is lying horizontally on a smooth incline plane which makes an angle of 45 &deg; with the horizontal. The minimum current flowing in the rod

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Correct answer: A. 30A

For the wire to remain stationary, the net force acting on it should be zero.
Balancing the forces along the incline,
$mgsin45 ° = ILBcos45 °$
$⇒ I = \left(\dfrac{m}{L}\right)\dfrac{g}{B}$
$⇒ I = \dfrac{\left(0 . 45\right)\left(10\right)}{0 . 15} = 30A$

As shown in the figure, a metallic rod of linear density 0 . 45kg m...

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