Answer :

(a) 4.9 mm

(b) 111o

Given, surface tension of mercury,

Radius of the capillary tube,

As the liquid is mercury, it will concave downwards.

Contact angle,

(a)The rise/depression is given by,

(b)Let the angle made by mercury be .

Given, new height(rise),

We know,


And —————(2)

Dividing (1) by (2)

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