# A disk rotating about a point on its circumference - 2

Consider a uniformly charged circular disk of radius $$R$$ having charge $$Q$$ rotating about a fixed point on its circumference with an angular velocity $$\omega$$ . The magnetic field created at this point due to the motion is $$k \times \dfrac{\mu_{0} Q \omega}{R}$$. Find the value of $$k$$ .

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