A) \[m\left( 1-\frac{a}{g} \right)\]
B) \[\left( 1+\frac{a}{g} \right)\]
C) \[m\]
D) Zero
Correct Answer: C
Solution :
A physical balance compares the mass on the two pans like two masses connected by string passing over the pulley. While a spring balance gives reading due to the net force with which the mass suspended from its hooks is pulled downwards. Thus the reading of the spring balance is affected depending upon the acceleration of the lift. But in case of physical balance, both the pans are equally affected by the movement of the lift. So readings of a physical balance are unaffected in a lift.
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