Two small balls of same size and masses m 1 and m 2 (m 1 > m 2 ) are tied by a thin weightless thread and dropped from a certain height. Taking upward buoyancy force F into account the tension T of the thread during the flight after the motion of the balls becomes uniform will be-
A
(m 1 – m 2 ) g
B
(m 1 – m 2 ) 
C
(m 1 + m 2 ) g
D
(m 1 + m 2 ) 
Text Solution
Verified by ExpertsThe correct answer is:
B
F b = Buoyancy force of air
m 1 : m 1 g = T + F b ……. (1)
m 2 : m 2 g + T = F b ……. (2)
From eq. (1) & (2)
m 1 g – T = m 2 g + T
⇒ T = 
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