A simple pendulum has a length λ , mass of bob m. The bob is given a charge q coulomb. The pendulum is suspended in a uniform horizontal electric field of strength E as shown in figure, then calculate the time period of oscillation when the bob is slightly displace from its mean position is:
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Time period of simple pendulum in air
When it is suspended between vertical plates of a charged parallel plate capacitor, then acceleration due to electric field,
This acceleration is acting horizontally and acceleration due to gravity is acting vertically. So, effective acceleration 
Hence, 
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