JEE MAIN - Physics (2003 - No. 58)
A light spring balance hangs from the hook of the other light spring balance and a block of mass $$M$$ $$kg$$ hangs from the former one. Then the true statement about the scale reading is
Both the scales read $$M$$ $$kg$$ each
The scale of the lower one reads $$M$$ $$kg$$ and of the upper one zero
The reading of the two scales can be anything but the sum of the reading will be $$M$$ $$kg$$
Both the scales read $$M/2$$ $$kg$$ each
Explanation
Question says, both spring balance are light that means springs are massless.
The Earth pulls the block by a force $$Mg.$$ The block in turn exerts a force $$Mg$$ on the spring of spring balance $${S_1}$$ which therefore shows a reading of $$Mkgf.$$
The spring $${S_1}$$ is massless. Therefore it exerts a force of $$Mg$$ on the spring of spring balance $${S_2}$$ which shows the reading of $$Mkgf.$$
Comments (0)
