A pendulum consists of a ball of mass m and charge − Q hung on a silk thread of length l . The time period of small oscillation is T 0 . A positive point charge is kept at three positions as in Figu

Question

A pendulum consists of a ball of mass m and charge − Q hung on a silk thread of length l . The time period of small oscillation is T 0 ​ . A positive point charge is kept at three positions as in Figure 5.100 ( A B = l ): Figure-I (below A ), Figure-II (at the point of suspension), Figure-III (at the level of A , to the side). Time periods are T 1 ​ , T 2 ​ , T 3 ​ . Choose the correct statement:

TestHub · Accepted Answer

I: attraction toward B adds to gravity, T 1 ​ < T 0 ​ . II: the force acts along the string at constant magnitude and adds nothing to the restoring force, T 2 ​ = T 0 ​ . III: the sideways attraction grows as the ball moves toward B and so reduces the net restoring effect, T 3 ​ > T 0 ​ . (Reasoned qualitatively; the printed key matches.)

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