When an electron mov box es at a speed v perpendicular to a uniform magnetic field of flux density B, the radius of its path is R.
A second electron moves at a speed $\frac{\text{V}}{2}$ perpendicular to a uniform magnetic field of flux density 4B.
What is the radius of the path of the second electron?
$\frac{\text{R}}{8}$
2 )
$\frac{\text{R}}{4}$
3 )
2R
4 )
8R
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