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_(2). Then the relation between T, T_(2) and T_(2) is

The time period of simple pendulum is 'T'. When the length increases b

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_(2). Then the relation between T, T_(2) 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