The time period of simple pendulum is T. When the length increases by 10 cm, its period is T_1. When the length is decreased by 10 cm, its period is T. Then the relation between T, T_1 and T_2 is

The time period of simple pendulum is T. When the length increases by

1.	The time period of simple pendulum is T. When the length increases by 10 cm, its period is T_1. When the length is decreased by 10 cm, its period is T. Then the relation between T, T_1 and T_2 is
Answer» `2/(T^2) = 1/(T_1^2) + 1/(T_2^2)` `2/(T^2) = 1/(T_1^2) - 1/(T_2^2)` `2T^2= T_1^2 + T_2^2` `2T^2 = T_1^2 - T_2^2` ANSWER :C