WAEC - Physics (2020 - No. 32)
An electron of mass m and charge e moves in a circular path in a magnetic field of flux density B. How long does it take to complete one orbit?
\(\frac{2me}{B\pi}\)
\(\frac{2B}{me\pi}\)
\(\frac{2\pi m}{Be}\)
\(\frac{Be}{2 \pi m}\)
Explanation
Motion of charged particles in Magnetic field
qvb = \(\frac{Mv^2}{r}\)
where q = e
Introducing Period (T) as time taken to complete one orbit = \(\frac{2πM}{qe}\)
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