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,


—————(1)


And —————(2)


Dividing (1) by (2)






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