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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Magnetic Properties of Matter

NTA Abhyas 2020 · Physics · Magnetic Properties of Matter

A pendulum of length L carries a negative charge - q on the bob. A...

A pendulum of length LL carries a negative charge −q- q on the bob. A positive charge +q+ q is held at the point of support. Then, the time period of the bob isA pendulum of length L carries a negative charge - q on the bob. A positive charge + q is held at the point of support.

Options

  1. AGreater than2πLg2\pi\sqrt{\dfrac{L}{g}}
  2. BLess than 2πLg2\pi\sqrt{\dfrac{L}{g}}
  3. Cequal to 2πLg2\pi\sqrt{\dfrac{L}{g}}
  4. DEqual to 2π2Lg2\pi\sqrt{\dfrac{2L}{g}}

Correct answer

C. equal to 2πLg2\pi\sqrt{\dfrac{L}{g}}

Step-by-step solution

There is no change in the restoring force as the electrostatic forces are the central forces. Negative and positive charges at the two extremities of the string affect tension TT which does not affect the restoring force

A pendulum of length L carries a negative charge - q on the bob. A positive charge + q is held at the point of support.
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