Physics · 2018
JEE Main · 15 April 2018, Shift 2 · Q20
A copper rod of mass m slides under gravity on two smooth parallel rails, with separation l and set at an angle of θ with the horizontal. At the…
A copper rod of mass m slides under gravity on two smooth parallel rails, with separation $\displaystyle l$ and set at an angle of $\displaystyle \theta$ with the horizontal. At the bottom, rails are joined by a resistance R. There is a uniform magnetic field B normal to the plane of the rails, as shown in the figure. The terminal speed of the copper rod is :
Official answer
(3)
$\displaystyle \frac{m g R \sin \theta}{B^2 l^2}$
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JEE Main 2018 Physics question, with the answer from NTA’s final answer key. Where our answers come from.