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Two point charges having equal charges ...

Two point charges having equal charges separated by 1m distances experience a force of 8N. What will be the force experienced by them , if they are held in water, at the same distance ?
( take , `K_(" water" ) = 80 ) `

Text Solution

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Force acting between two point charges
` " "F= ( 1)/(4piin _0 ) (q_1q_2)/(r^(2)) or, F prop (1)/(K) `
` rArr " " (F_(" air"))/( F_(" medium " )) = K rArr ( 8)/(F_(" water" ) ) = 80 `
` rArr " " F_(" water" ) = (8)/(80 ) = (1)/(10) N`
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