physics
posted by sara .
explai biotsavart,law.an electron with velocity 3*107ms1 describe a circular path in a uniform magnetic field of 0.2T,perpendicular to it.calculate the radius of path

The magnetic field B provides the centripetal force to keep it in a circular path.
e V B = m V^2/R
R = mV/(eB)
m and e are the electron mass and charge.
You don't need the Biot Savart Law for this question. There are plenty of good explanations of it online.
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