Assume the radius of a neutron to be approximately 1.0×10−13 cm, and calculate the density of a neutron. [hint: for a sphere v=(4/3)πr3.]

The density of the neutron,

Here, m is the mass and V is the volume.

Now to calculate the volume of a neutron, we use the formula

Here r is the radius of the neutron and its value of

So,

We know the mass of neutron,

Thus,  

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the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this