Find the depth at which an air bubble of radius 0.0003 m will remain in equilibrium in water given surface tension of water
=7* 10-2 N/m, g= 9.8m/s-²

h = 0.047 m

Explanation:

It is given that,

Radius of an air bubble is 0.0003 m

The surface tension of water is

We need to find the the depth at which an air bubble of radius 0.0003 m will  remain in equilibrium in water. Let it is given by h.

The excess pressure inside air bubble Is given by the formula as follows :

.....(1)

T is surface tension

Also, pressure due to a height is given by :

So, equation (1) becomes :

So,

So, the depth is 0.047 m.

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explanation:

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it