A metallic rod of mass per unit length is lying horizontally on a smooth inclined plane which makes an angle of
with the horizontal. A magnetic field of strength
is acting on it in the vertical direction. When a current '
' is flowing through it, the rod is not allowed to slide down. The quantity of current required to keep the rod stationary is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Mass per unit length of a metallic rod is
Let be the current flowing.
For equilibrium,
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