A conductor swing inside a magnetic flux density $$B = 0.5 \,\text{T}$$ is deflected by an angle of $$\alpha = 10^\circ$$ due to the Lorentz force.

How large is the DC current $$I$$ through the conductor in units of milliamps (mA), to the nearest integer?


Details and Assumptions:

• The conductor swing is a pendulum with mass $$m = 4\text{ g}$$.
• Take the gravity acceleration as $$g = 10 \,\text{m}/\text{s}^2$$.
• The lenght of the swinging conductor inside the magnetic field is $$l = 6\, \text{cm}$$.
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