Charged particle moving in a circle around a long line charge or charged cylinder: speed, kinetic energy or period

1. A.
   $\frac{\rho qR^{2}}{4\varepsilon_{0}}$
2. B.
   $\frac{\rho qR^{2}}{2\varepsilon_{0}}$
3. C.
   $\frac{q\rho}{4\varepsilon_{0}R^{2}}$
4. D.
   $\frac{4\varepsilon_{0}R^{2}}{q\rho}$

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1. A.
   $T^{2} = \frac{4\pi^{2}\text{ }m}{2k\lambda q}r^{3}$
2. B.
   $T = 2\pi r\sqrt{\frac{m}{2k\lambda q}}$
3. C.
   $T = \frac{1}{2\pi r}\sqrt{\frac{m}{2k\lambda q}}$
4. D.
   $T = \frac{1}{2\pi}\sqrt{\frac{2k\lambda q}{m}}$

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1. A.
2. B.
3. C.
4. D.

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