Two small spheres,each having an equal positive charge $Q$ (Coulomb),are suspended by two insulating strings of equal length $L$ (metre) from a rigid hook. The whole setup is taken into a satellite where there is no gravity. The two balls are now held by electrostatic forces in a horizontal position. The tension in each string is then:

• A
  $\frac{Q^2}{16 \pi \varepsilon_0 L^2}$
• B
  $\frac{Q^2}{8 \pi \varepsilon_0 L^2}$
• C
  $\frac{Q^2}{4 \pi \varepsilon_0 L^2}$
• D
  $\frac{Q^2}{2 \pi \varepsilon_0 L^2}$