Question

solve it ..........​

Answer 1

Answer:

2.45

Explanation:

Using direct formula when half of potential energy lies in region of radius 'r' =√ab

Where a, and b are the radius of spheres .

r = √3*2 = √6 = 2.45cm answer .

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Explained solution is in this given attachment.

Hope it's helpful

Answer 2

Answer :

Refer the attachment ⬆️

Explanation :

According to the question :

• L = Length of cylindrical capacitor
• R = Distance of the point from centre or axis

According to the condition :

For r = b, u = Ub, Ub = q^2 / 4πe0L1 log^e ( b / a )

Finally, we have used the formula,

⇛For, u r / u b = 1 / 2 , we have

⇛log ( r / a ) = 1 / 2 log ( b / a )

⇛r / a = √ b / a

⇛r = √ab

⇛√6

⇛2.45

So, It's Done !!