Answer VerifiedHint:Use the formula for time period of a simple pendulum and find the relation between the time period and acceleration due to gravity. Then use the fact that the value of g is inversely proportional to the square of the distance (r) from the centre to the surface of earth. Formula used: $T=2\pi \sqrt{\dfrac{l}{g}}$Complete step by step answer: Hence, the correct option is A. Note:The formula for the time period given above is only applicable when the pendulum is placed in air and the air resistance is ignored. When another external force (including gravity) acts on the bob of the pendulum, the formula for the time period changes to $T=2\pi \sqrt{\dfrac{l}{{{g}_{eff}}}}$ .Here, ${{g}_{eff}}$ is the effect acceleration due to the gravitational force and the other force. In other words, it is the acceleration due to the net external force.Note that tension is an internal force. |