At one atmosphere of pressure and 25°c, a hot air balloon has a volume of 4,000 liters. while still tied to the ground, the air in the balloon is heated to 68°c. when the balloon is untied, ready to float away, it has a new volume of

a) 1088 liters
b) 3496 liters
c) 4577 liters
d) 9280 liters

C) 4577 Liters

Explanation:

As we know that pressure inside the balloon will remain constant so here by ideal gas equation we can say

now since pressure is constant so we will have

now for two different temperatures we will have

given that

now from above equation we will have

iron would move it is magnetic there is a mag field around the current in the wire