Question

As shown in the figure, a metallic rod of linear density $0.45\ kg m^{-1}$ is lying horizontally on a smooth incline plane which makes an angle of 45° with the horizontal. The minimum current flowing in the rod required to keep it stationary, when $0.15 T$ magnetic field is acting on it in the vertical upward direction, will be: {Use $g = 10 m/s^2$}

• A. $30 \,A$
• B. $15\, A$
• C. $10\, A$
• D. $3 \,A$

Answer 1

Answer: (A)

$30 \,A$

Answer 2

From the given options the correct answer is option (A): $30A$