A spring balance and a physical balance are kept in a lift. In these balance equal masses are placed. If now the lift starts moving upward with constant acceleration, then.

Options

A. The reading of spring balance will increase and the equilibrium position of the physical balance will disturb
B. The reading of spring balance will remain unchanged and physical balance will remain in equilibrium
C. The reading of spring balance will decrease and physical balance will remain in equilibrium
D. The reading of spring balance will increase and the physical balance will remain in equilibrium

Answer

D

Explanation

The fictitious force will act downwards. So the reading of spring balance will increase. In case of physical balance, the fictitious force will act on both the pans, so the equilibrium is not affected.