Question

a solid metallic cube of edge 10 cm and charge 12 mc has a spherical cavity of radius 2 cm near its centre the electric feild due to the cube just outside its surface is

Answer 1

Answer:

10 cm

Explanation:

Let the edge of the other cube be 'a'.

Given, 12

3

=b

3

+8

3

+a

3

(volume remains the same)

a

3

=12

3

−6

3

−8

3.

a

3

=1728−216−512

a

3

=1000

a=10

Edge of the cube = 10 cm.

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