An electron with a speed \( v_{0}c \) moves in a circle of radius \...

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An electron with a speed \( v_{0}c \) moves in a circle of radius \( r_{0} \) in a uniform magnetic field. The time required for one revolution of the electron is \( T_{0} \). The speed of the electron is now doubled to \( 2 v_{0} \).
The radius of the circle will change to
(a) \( 4 r_{0} \)
(b) \( 2 r_{0} \)
(c) \( r_{0} \)
(d) \( r_{0} / 2 \)
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