An Electron with a Speed of 6 $\circ$ to the Magnetic Field Lines

An electron with a speed of 6.0 * 10⁵ m/s enters a uniform magnetic field of 0.060 T at an angle of 25 ^$\circ$ to the magnetic field lines.The electron will travel in a helical path.What is the radius of the helical path?

A) 1.3 * 10^-5 m
B) 2.4 * 10^-5 m
C) 4.8 * 10^-5 m
D) 5.7 *10^-5 m

Correct Answer:

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