An electron revolves in a circular orbit of radius r with n revolutions per second. What is the magnitude of the magnetic field at the centre of the orbit?
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An electron revolves in a circular orbit of radius r with n revolutions per second. What is the magnitude of the magnetic field at the centre of the orbit?

G1 Physics · Accepted Answer

Step 1: A charge e completing n revolutions each second produces current magnitude I = en. Step 2: The field at the centre of a circular current loop is B = μ₀I/(2r). Step 3: Substitute I = en: B = μ₀en/(2r). Final answer: (D) μ₀en/(2r).