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An air bubble with a radius R and an iron ball of same radius are present in water. The distance between the centres of bubble and iron ball is 1 m. Neglect the mass of air in the bubble. The mass of water drop whose size is equal to the size of double is 1.5 kg.  The densities of water and iron are 1 g/cm3 and 8 g/cm3 respectively. The force between bubble and iron ball is (approximately)

(a)

repulsive, equal to 2.2 X 10-9 N

(b)

attractive, equal to 1.1 X 10-9 N

(c)

repulsive, equal to 1.1 X 10-9 N

(d)

attractive, equal to 2.2 X 10-9 N



Question ID - 152080 | SaraNextGen Top Answer

An air bubble with a radius R and an iron ball of same radius are present in water. The distance between the centres of bubble and iron ball is 1 m. Neglect the mass of air in the bubble. The mass of water drop whose size is equal to the size of double is 1.5 kg.  The densities of water and iron are 1 g/cm3 and 8 g/cm3 respectively. The force between bubble and iron ball is (approximately)

(a)

repulsive, equal to 2.2 X 10-9 N

(b)

attractive, equal to 1.1 X 10-9 N

(c)

repulsive, equal to 1.1 X 10-9 N

(d)

attractive, equal to 2.2 X 10-9 N

1 Answer
127 votes
Answer Key / Explanation : (c) -

repulsive, equal to 1.1 X 10-9 N

127 votes


127