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Standard XII
Physics
Question

The bob of a pendulum is positively charged. Another identical charge is placed at the point of suspension of the pendulum. The time period of pendulum


  1. increases
  2. decreases
  3. becomes zero
  4. remains same

A
remains same
B
increases
C
decreases
D
becomes zero
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Solution
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The force due to the charge kept at the suspension point always acts along the wire which is compensated by increase in tension of the string. This force never accounts for change in time period since it has no component perpendicular to the wire.

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