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A simple pendulum is set up in a trolley which moves to the right with an acceleration a on a horizontal plane. Then the thread of the pendulum in the mean position makes an angle $\theta $ with the vertical
  • A${\tan ^{ - 1}}\frac{a}{g}$ in the forward direction
  • B${\tan ^{ - 1}}\frac{a}{g}$ in the backward direction
  • C${\tan ^{ - 1}}\frac{g}{a}$ in the backward direction
  • D${\tan ^{ - 1}}\frac{g}{a}$ in the forward direction
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