If block is at verge of motion, then select the correct option (where $\mathrm{\mu }$ is the coefficient of friction)

The minimum value of coefficient of friction $\left(\mathrm{\mu }\right)$ such that block of mass $\text{'}5 \mathrm{kg}\text{'}$ remains at rest is

If the coefficient of friction between the block of mass $5 \mathrm{kg}$ and wall is $0.5,$ then minimum force $F$ required to hold the block with the wall is $\left(g=10 \mathrm{m} {\mathrm{s}}^{-2}\right)$

In the given diagram, reading of spring balance will be $\left(g=10 \mathrm{m} {\mathrm{s}}^{-2}\right)$