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JEE Main Physics question

PhysicsExperimental SkillsJEE Main

A student uses a simple pendulum of exactly length to determine , the acceleration due to gravity. He uses a stop watch with the least count of for this and records 40 seconds for 20 oscillations. For this observation, which of the following statement(s) is (are) true? **[IIT JEE 2010]**

Answer: (A),(C)

Solution

. Since the total time (40 s) has an error of , the error in the period is . Then

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Question ID VK-157500